diff --git a/src/webui/www/private/addpeers.html b/src/webui/www/private/addpeers.html
index e2b7de6ed..6bc225449 100644
--- a/src/webui/www/private/addpeers.html
+++ b/src/webui/www/private/addpeers.html
@@ -24,15 +24,16 @@
             }
         }).activate();
 
-        window.addEvent("domready", () => {
+        window.addEventListener("DOMContentLoaded", () => {
             const hash = new URI().getData("hash");
             if (!hash)
-                return false;
+                return;
 
             $("peers").focus();
 
-            $("addPeersOk").addEvent("click", (e) => {
-                new Event(e).stop();
+            $("addPeersOk").addEventListener("click", (e) => {
+                e.preventDefault();
+                e.stopPropagation();
 
                 const peers = $("peers").value.trim().split(/[\r\n]+/);
                 if (peers.length === 0)
diff --git a/src/webui/www/private/addtrackers.html b/src/webui/www/private/addtrackers.html
index 4be76ebef..42f63dd97 100644
--- a/src/webui/www/private/addtrackers.html
+++ b/src/webui/www/private/addtrackers.html
@@ -10,7 +10,7 @@
     <script>
         "use strict";
 
-        window.addEvent("domready", () => {
+        window.addEventListener("DOMContentLoaded", () => {
             new Keyboard({
                 defaultEventType: "keydown",
                 events: {
@@ -26,8 +26,10 @@
             }).activate();
 
             $("trackersUrls").focus();
-            $("addTrackersButton").addEvent("click", (e) => {
-                new Event(e).stop();
+            $("addTrackersButton").addEventListener("click", (e) => {
+                e.preventDefault();
+                e.stopPropagation();
+
                 const hash = new URI().getData("hash");
                 new Request({
                     url: "api/v2/torrents/addTrackers",
diff --git a/src/webui/www/private/confirmdeletion.html b/src/webui/www/private/confirmdeletion.html
index b5f02e0e9..c8085c020 100644
--- a/src/webui/www/private/confirmdeletion.html
+++ b/src/webui/www/private/confirmdeletion.html
@@ -21,7 +21,7 @@
                 icon.style.fill = "var(--color-border-default)";
         }
 
-        window.addEvent("domready", () => {
+        window.addEventListener("DOMContentLoaded", () => {
             new Request({
                 url: "images/object-locked.svg",
                 method: "get",
@@ -41,12 +41,12 @@
             let prefDeleteContentFiles = prefCache.delete_torrent_content_files;
 
             $("deleteFromDiskCB").checked ||= prefDeleteContentFiles;
-            $("deleteFromDiskCB").addEvent("click", (e) => {
+            $("deleteFromDiskCB").addEventListener("click", (e) => {
                 setRememberBtnEnabled($("deleteFromDiskCB").checked !== prefDeleteContentFiles);
             });
 
             // Set current "Delete files" choice as the default
-            $("rememberBtn").addEvent("click", (e) => {
+            $("rememberBtn").addEventListener("click", (e) => {
                 window.parent.qBittorrent.Cache.preferences.set({
                     data: {
                         "delete_torrent_content_files": $("deleteFromDiskCB").checked
@@ -60,13 +60,16 @@
 
             const hashes = new URI().getData("hashes").split("|");
             $("cancelBtn").focus();
-            $("cancelBtn").addEvent("click", (e) => {
-                new Event(e).stop();
+            $("cancelBtn").addEventListener("click", (e) => {
+                e.preventDefault();
+                e.stopPropagation();
                 window.parent.qBittorrent.Client.closeWindows();
             });
-            $("confirmBtn").addEvent("click", (e) => {
+            $("confirmBtn").addEventListener("click", (e) => {
+                e.preventDefault();
+                e.stopPropagation();
+
                 parent.torrentsTable.deselectAll();
-                new Event(e).stop();
                 const cmd = "api/v2/torrents/delete";
                 const deleteFiles = $("deleteFromDiskCB").checked;
                 new Request({
diff --git a/src/webui/www/private/confirmfeeddeletion.html b/src/webui/www/private/confirmfeeddeletion.html
index 6ee6e4175..dcb0ce79d 100644
--- a/src/webui/www/private/confirmfeeddeletion.html
+++ b/src/webui/www/private/confirmfeeddeletion.html
@@ -10,15 +10,18 @@
     <script>
         "use strict";
 
-        window.addEvent("domready", () => {
+        window.addEventListener("DOMContentLoaded", () => {
             const paths = new URI().getData("paths").split("|");
             $("cancelBtn").focus();
-            $("cancelBtn").addEvent("click", (e) => {
-                new Event(e).stop();
+            $("cancelBtn").addEventListener("click", (e) => {
+                e.preventDefault();
+                e.stopPropagation();
                 window.parent.qBittorrent.Client.closeWindows();
             });
-            $("confirmBtn").addEvent("click", (e) => {
-                new Event(e).stop();
+            $("confirmBtn").addEventListener("click", (e) => {
+                e.preventDefault();
+                e.stopPropagation();
+
                 let completionCount = 0;
                 paths.forEach((path) => {
                     new Request({
diff --git a/src/webui/www/private/confirmruleclear.html b/src/webui/www/private/confirmruleclear.html
index 3e170c9b1..607e317aa 100644
--- a/src/webui/www/private/confirmruleclear.html
+++ b/src/webui/www/private/confirmruleclear.html
@@ -10,16 +10,19 @@
     <script>
         "use strict";
 
-        window.addEvent("domready", () => {
+        window.addEventListener("DOMContentLoaded", () => {
             const rules = new URI().getData("rules").split("|");
 
             $("cancelBtn").focus();
-            $("cancelBtn").addEvent("click", (e) => {
-                new Event(e).stop();
+            $("cancelBtn").addEventListener("click", (e) => {
+                e.preventDefault();
+                e.stopPropagation();
                 window.parent.MochaUI.closeWindow(window.parent.$("clearRulesPage"));
             });
-            $("confirmBtn").addEvent("click", (e) => {
-                new Event(e).stop();
+            $("confirmBtn").addEventListener("click", (e) => {
+                e.preventDefault();
+                e.stopPropagation();
+
                 let completionCount = 0;
                 rules.forEach((rule) => {
                     window.parent.qBittorrent.RssDownloader.modifyRuleState(decodeURIComponent(rule), "previouslyMatchedEpisodes", [], () => {
diff --git a/src/webui/www/private/confirmruledeletion.html b/src/webui/www/private/confirmruledeletion.html
index 6651c82ed..7c3ad6c1c 100644
--- a/src/webui/www/private/confirmruledeletion.html
+++ b/src/webui/www/private/confirmruledeletion.html
@@ -10,16 +10,19 @@
     <script>
         "use strict";
 
-        window.addEvent("domready", () => {
+        window.addEventListener("DOMContentLoaded", () => {
             const rules = new URI().getData("rules").split("|");
 
             $("cancelBtn").focus();
-            $("cancelBtn").addEvent("click", (e) => {
-                new Event(e).stop();
+            $("cancelBtn").addEventListener("click", (e) => {
+                e.preventDefault();
+                e.stopPropagation();
                 window.parent.MochaUI.closeWindow(window.parent.$("removeRulePage"));
             });
-            $("confirmBtn").addEvent("click", (e) => {
-                new Event(e).stop();
+            $("confirmBtn").addEventListener("click", (e) => {
+                e.preventDefault();
+                e.stopPropagation();
+
                 let completionCount = 0;
                 rules.forEach((rule) => {
                     new Request({
diff --git a/src/webui/www/private/edittracker.html b/src/webui/www/private/edittracker.html
index f08869c25..4e476fcf7 100644
--- a/src/webui/www/private/edittracker.html
+++ b/src/webui/www/private/edittracker.html
@@ -10,7 +10,7 @@
     <script>
         "use strict";
 
-        window.addEvent("domready", () => {
+        window.addEventListener("DOMContentLoaded", () => {
             new Keyboard({
                 defaultEventType: "keydown",
                 events: {
@@ -31,13 +31,15 @@
 
             const currentUrl = new URI().getData("url");
             if (!currentUrl)
-                return false;
+                return;
 
             $("trackerUrl").value = currentUrl;
             $("trackerUrl").focus();
 
-            $("editTrackerButton").addEvent("click", (e) => {
-                new Event(e).stop();
+            $("editTrackerButton").addEventListener("click", (e) => {
+                e.preventDefault();
+                e.stopPropagation();
+
                 const hash = new URI().getData("hash");
                 new Request({
                     url: "api/v2/torrents/editTracker",
diff --git a/src/webui/www/private/newcategory.html b/src/webui/www/private/newcategory.html
index 692353d87..700b0d1af 100644
--- a/src/webui/www/private/newcategory.html
+++ b/src/webui/www/private/newcategory.html
@@ -30,7 +30,7 @@
             }
         }).activate();
 
-        window.addEvent("domready", () => {
+        window.addEventListener("DOMContentLoaded", () => {
             const uriAction = window.qBittorrent.Misc.safeTrim(new URI().getData("action"));
             const uriHashes = window.qBittorrent.Misc.safeTrim(new URI().getData("hashes"));
             const uriCategoryName = window.qBittorrent.Misc.safeTrim(new URI().getData("categoryName"));
@@ -38,7 +38,7 @@
 
             if (uriAction === "edit") {
                 if (!uriCategoryName)
-                    return false;
+                    return;
 
                 $("categoryName").disabled = true;
                 $("categoryName").value = window.qBittorrent.Misc.escapeHtml(uriCategoryName);
@@ -53,8 +53,9 @@
                 $("categoryName").focus();
             }
 
-            $("categoryNameButton").addEvent("click", (e) => {
-                new Event(e).stop();
+            $("categoryNameButton").addEventListener("click", (e) => {
+                e.preventDefault();
+                e.stopPropagation();
 
                 const savePath = $("savePath").value.trim();
                 const categoryName = $("categoryName").value.trim();
diff --git a/src/webui/www/private/newfeed.html b/src/webui/www/private/newfeed.html
index 9a24a88f0..0887dce73 100644
--- a/src/webui/www/private/newfeed.html
+++ b/src/webui/www/private/newfeed.html
@@ -28,11 +28,13 @@
                 }
             }
         }).activate();
-        window.addEvent("domready", () => {
+        window.addEventListener("DOMContentLoaded", () => {
             $("feedURL").focus();
             const path = new URI().getData("path");
-            $("submitButton").addEvent("click", (e) => {
-                new Event(e).stop();
+            $("submitButton").addEventListener("click", (e) => {
+                e.preventDefault();
+                e.stopPropagation();
+
                 // check field
                 const feedURL = $("feedURL").value.trim();
                 if (feedURL === "") {
diff --git a/src/webui/www/private/newfolder.html b/src/webui/www/private/newfolder.html
index cd4c0a9e3..74be677e8 100644
--- a/src/webui/www/private/newfolder.html
+++ b/src/webui/www/private/newfolder.html
@@ -29,11 +29,13 @@
                 }
             }
         }).activate();
-        window.addEvent("domready", () => {
+        window.addEventListener("DOMContentLoaded", () => {
             $("folderName").focus();
             const path = new URI().getData("path");
-            $("submitButton").addEvent("click", (e) => {
-                new Event(e).stop();
+            $("submitButton").addEventListener("click", (e) => {
+                e.preventDefault();
+                e.stopPropagation();
+
                 // check field
                 const folderName = $("folderName").value.trim();
                 if (folderName === "") {
diff --git a/src/webui/www/private/newrule.html b/src/webui/www/private/newrule.html
index b372db7cc..09a2708df 100644
--- a/src/webui/www/private/newrule.html
+++ b/src/webui/www/private/newrule.html
@@ -28,10 +28,12 @@
                 }
             }
         }).activate();
-        window.addEvent("domready", () => {
+        window.addEventListener("DOMContentLoaded", () => {
             $("name").focus();
-            $("submitButton").addEvent("click", (e) => {
-                new Event(e).stop();
+            $("submitButton").addEventListener("click", (e) => {
+                e.preventDefault();
+                e.stopPropagation();
+
                 // check field
                 const name = $("name").value.trim();
                 if (name === "") {
diff --git a/src/webui/www/private/newtag.html b/src/webui/www/private/newtag.html
index dc2615336..c661e98bb 100644
--- a/src/webui/www/private/newtag.html
+++ b/src/webui/www/private/newtag.html
@@ -29,7 +29,7 @@
             }
         }).activate();
 
-        window.addEvent("domready", () => {
+        window.addEventListener("DOMContentLoaded", () => {
             const uriAction = window.qBittorrent.Misc.safeTrim(new URI().getData("action"));
             const uriHashes = window.qBittorrent.Misc.safeTrim(new URI().getData("hashes"));
 
@@ -38,8 +38,9 @@
 
             $("tagName").focus();
 
-            $("tagNameButton").addEvent("click", (e) => {
-                new Event(e).stop();
+            $("tagNameButton").addEventListener("click", (e) => {
+                e.preventDefault();
+                e.stopPropagation();
 
                 const tagName = $("tagName").value.trim();
 
diff --git a/src/webui/www/private/rename.html b/src/webui/www/private/rename.html
index 514a6740a..a59b7379c 100644
--- a/src/webui/www/private/rename.html
+++ b/src/webui/www/private/rename.html
@@ -29,19 +29,21 @@
             }
         }).activate();
 
-        window.addEvent("domready", () => {
+        window.addEventListener("DOMContentLoaded", () => {
             const name = new URI().getData("name");
             // set text field to current value
             if (name)
                 $("rename").value = name;
 
             $("rename").focus();
-            $("renameButton").addEvent("click", (e) => {
-                new Event(e).stop();
+            $("renameButton").addEventListener("click", (e) => {
+                e.preventDefault();
+                e.stopPropagation();
+
                 // check field
                 const name = $("rename").value.trim();
                 if ((name === null) || (name === ""))
-                    return false;
+                    return;
 
                 const hash = new URI().getData("hash");
                 if (hash) {
diff --git a/src/webui/www/private/rename_feed.html b/src/webui/www/private/rename_feed.html
index f1fdf2138..0b38ce3c7 100644
--- a/src/webui/www/private/rename_feed.html
+++ b/src/webui/www/private/rename_feed.html
@@ -28,15 +28,17 @@
                 }
             }
         }).activate();
-        window.addEvent("domready", () => {
+        window.addEventListener("DOMContentLoaded", () => {
             const oldPath = new URI().getData("oldPath");
 
             $("rename").value = oldPath;
             $("rename").focus();
             $("rename").setSelectionRange(0, oldPath.length);
 
-            $("renameButton").addEvent("click", (e) => {
-                new Event(e).stop();
+            $("renameButton").addEventListener("click", (e) => {
+                e.preventDefault();
+                e.stopPropagation();
+
                 // check field
                 const newPath = $("rename").value.trim();
                 if (newPath === "") {
diff --git a/src/webui/www/private/rename_file.html b/src/webui/www/private/rename_file.html
index c00df06b6..bdb10aae3 100644
--- a/src/webui/www/private/rename_file.html
+++ b/src/webui/www/private/rename_file.html
@@ -30,7 +30,7 @@
             }
         }).activate();
 
-        window.addEvent("domready", () => {
+        window.addEventListener("DOMContentLoaded", () => {
             const hash = new URI().getData("hash");
             const oldPath = new URI().getData("path");
             const isFolder = ((new URI().getData("isFolder")) === "true");
@@ -41,8 +41,10 @@
             if (!isFolder)
                 $("rename").setSelectionRange(0, oldName.lastIndexOf("."));
 
-            $("renameButton").addEvent("click", (e) => {
-                new Event(e).stop();
+            $("renameButton").addEventListener("click", (e) => {
+                e.preventDefault();
+                e.stopPropagation();
+
                 // check field
                 const newName = $("rename").value.trim();
                 if (newName === "") {
diff --git a/src/webui/www/private/rename_files.html b/src/webui/www/private/rename_files.html
index 8b03d5c16..290490b2f 100644
--- a/src/webui/www/private/rename_files.html
+++ b/src/webui/www/private/rename_files.html
@@ -55,7 +55,7 @@
             checkboxHeader = new Element("input");
             checkboxHeader.type = "checkbox";
             checkboxHeader.id = "rootMultiRename_cb";
-            checkboxHeader.addEvent("click", (e) => {
+            checkboxHeader.addEventListener("click", (e) => {
                 bulkRenameFilesTable.toggleGlobalCheckbox();
                 fileRenamer.selectedFiles = bulkRenameFilesTable.getSelectedRows();
                 fileRenamer.update();
@@ -143,7 +143,7 @@
         };
 
         // Setup Search Events that control renaming
-        $("multiRenameSearch").addEvent("input", (e) => {
+        $("multiRenameSearch").addEventListener("input", (e) => {
             const sanitized = e.target.value.replace(/\n/g, "");
             $("multiRenameSearch").value = sanitized;
 
@@ -152,17 +152,17 @@
             LocalPreferences.set("multirename_search", sanitized);
             fileRenamer.setSearch(sanitized);
         });
-        $("use_regex_search").addEvent("change", (e) => {
+        $("use_regex_search").addEventListener("change", (e) => {
             fileRenamer.useRegex = e.target.checked;
             LocalPreferences.set("multirename_useRegex", e.target.checked);
             fileRenamer.update();
         });
-        $("match_all_occurrences").addEvent("change", (e) => {
+        $("match_all_occurrences").addEventListener("change", (e) => {
             fileRenamer.matchAllOccurrences = e.target.checked;
             LocalPreferences.set("multirename_matchAllOccurrences", e.target.checked);
             fileRenamer.update();
         });
-        $("case_sensitive").addEvent("change", (e) => {
+        $("case_sensitive").addEventListener("change", (e) => {
             fileRenamer.caseSensitive = e.target.checked;
             LocalPreferences.set("multirename_caseSensitive", e.target.checked);
             fileRenamer.update();
@@ -190,7 +190,7 @@
         };
 
         // Setup Replace Events that control renaming
-        $("multiRenameReplace").addEvent("input", (e) => {
+        $("multiRenameReplace").addEventListener("input", (e) => {
             const sanitized = e.target.value.replace(/\n/g, "");
             $("multiRenameReplace").value = sanitized;
 
@@ -199,22 +199,22 @@
             LocalPreferences.set("multirename_replace", sanitized);
             fileRenamer.setReplacement(sanitized);
         });
-        $("applies_to_option").addEvent("change", (e) => {
+        $("applies_to_option").addEventListener("change", (e) => {
             fileRenamer.appliesTo = e.target.value;
             LocalPreferences.set("multirename_appliesTo", e.target.value);
             fileRenamer.update();
         });
-        $("include_files").addEvent("change", (e) => {
+        $("include_files").addEventListener("change", (e) => {
             fileRenamer.includeFiles = e.target.checked;
             LocalPreferences.set("multirename_includeFiles", e.target.checked);
             fileRenamer.update();
         });
-        $("include_folders").addEvent("change", (e) => {
+        $("include_folders").addEventListener("change", (e) => {
             fileRenamer.includeFolders = e.target.checked;
             LocalPreferences.set("multirename_includeFolders", e.target.checked);
             fileRenamer.update();
         });
-        $("file_counter").addEvent("input", (e) => {
+        $("file_counter").addEventListener("input", (e) => {
             let value = e.target.valueAsNumber;
             if (!value)
                 value = 0;
@@ -229,7 +229,7 @@
         });
 
         // Setup Rename Operation Events
-        $("renameButton").addEvent("click", (e) => {
+        $("renameButton").addEventListener("click", (e) => {
             // Disable Search Options
             $("multiRenameSearch").disabled = true;
             $("use_regex_search").disabled = true;
@@ -281,7 +281,7 @@
             if (err.xhr.status === 409)
                 $("rename_error").textContent = `QBT_TR(Rename failed: file or folder already exists)QBT_TR[CONTEXT=PropertiesWidget] \`${row.renamed}\``;
         };
-        $("renameOptions").addEvent("change", (e) => {
+        $("renameOptions").addEventListener("change", (e) => {
             const combobox = e.target;
             const replaceOperation = combobox.value;
             if (replaceOperation === "Replace")
@@ -293,7 +293,7 @@
             LocalPreferences.set("multirename_replaceAll", fileRenamer.replaceAll);
             $("renameButton").value = replaceOperation;
         });
-        $("closeButton").addEvent("click", () => {
+        $("closeButton").addEventListener("click", () => {
             window.parent.qBittorrent.Client.closeWindows();
             event.preventDefault();
         });
diff --git a/src/webui/www/private/rename_rule.html b/src/webui/www/private/rename_rule.html
index 661524c73..a7cf930f8 100644
--- a/src/webui/www/private/rename_rule.html
+++ b/src/webui/www/private/rename_rule.html
@@ -28,15 +28,17 @@
                 }
             }
         }).activate();
-        window.addEvent("domready", () => {
+        window.addEventListener("DOMContentLoaded", () => {
             const oldName = new URI().getData("rule");
 
             $("rename").value = oldName;
             $("rename").focus();
             $("rename").setSelectionRange(0, oldName.length);
 
-            $("renameButton").addEvent("click", (e) => {
-                new Event(e).stop();
+            $("renameButton").addEventListener("click", (e) => {
+                e.preventDefault();
+                e.stopPropagation();
+
                 // check field
                 const newName = $("rename").value.trim();
                 if (newName === "") {
diff --git a/src/webui/www/private/scripts/client.js b/src/webui/www/private/scripts/client.js
index 87bebda72..d1217e7fb 100644
--- a/src/webui/www/private/scripts/client.js
+++ b/src/webui/www/private/scripts/client.js
@@ -164,7 +164,7 @@ window.addEventListener("DOMContentLoaded", () => {
         LocalPreferences.set("properties_height_rel", properties_height_rel);
     };
 
-    window.addEvent("resize", () => {
+    window.addEventListener("resize", () => {
         // only save sizes if the columns are visible
         if (!$("mainColumn").hasClass("invisible"))
             saveColumnSizes.delay(200); // Resizing might takes some time.
@@ -1000,7 +1000,7 @@ window.addEventListener("DOMContentLoaded", () => {
         }
     };
 
-    $("alternativeSpeedLimits").addEvent("click", () => {
+    $("alternativeSpeedLimits").addEventListener("click", () => {
         // Change icon immediately to give some feedback
         updateAltSpeedIcon(!alternativeSpeedLimits);
 
@@ -1018,10 +1018,10 @@ window.addEventListener("DOMContentLoaded", () => {
         }).send();
     });
 
-    $("DlInfos").addEvent("click", globalDownloadLimitFN);
-    $("UpInfos").addEvent("click", globalUploadLimitFN);
+    $("DlInfos").addEventListener("click", globalDownloadLimitFN);
+    $("UpInfos").addEventListener("click", globalUploadLimitFN);
 
-    $("showTopToolbarLink").addEvent("click", (e) => {
+    $("showTopToolbarLink").addEventListener("click", (e) => {
         showTopToolbar = !showTopToolbar;
         LocalPreferences.set("show_top_toolbar", showTopToolbar.toString());
         if (showTopToolbar) {
@@ -1035,7 +1035,7 @@ window.addEventListener("DOMContentLoaded", () => {
         MochaUI.Desktop.setDesktopSize();
     });
 
-    $("showStatusBarLink").addEvent("click", (e) => {
+    $("showStatusBarLink").addEventListener("click", (e) => {
         showStatusBar = !showStatusBar;
         LocalPreferences.set("show_status_bar", showStatusBar.toString());
         if (showStatusBar) {
@@ -1069,11 +1069,11 @@ window.addEventListener("DOMContentLoaded", () => {
         navigator.registerProtocolHandler("magnet", templateUrl,
             "qBittorrent WebUI magnet handler");
     };
-    $("registerMagnetHandlerLink").addEvent("click", (e) => {
+    $("registerMagnetHandlerLink").addEventListener("click", (e) => {
         registerMagnetHandler();
     });
 
-    $("showFiltersSidebarLink").addEvent("click", (e) => {
+    $("showFiltersSidebarLink").addEventListener("click", (e) => {
         showFiltersSidebar = !showFiltersSidebar;
         LocalPreferences.set("show_filters_sidebar", showFiltersSidebar.toString());
         if (showFiltersSidebar) {
@@ -1089,7 +1089,7 @@ window.addEventListener("DOMContentLoaded", () => {
         MochaUI.Desktop.setDesktopSize();
     });
 
-    $("speedInBrowserTitleBarLink").addEvent("click", (e) => {
+    $("speedInBrowserTitleBarLink").addEventListener("click", (e) => {
         speedInTitle = !speedInTitle;
         LocalPreferences.set("speed_in_browser_title_bar", speedInTitle.toString());
         if (speedInTitle)
@@ -1099,19 +1099,19 @@ window.addEventListener("DOMContentLoaded", () => {
         processServerState();
     });
 
-    $("showSearchEngineLink").addEvent("click", (e) => {
+    $("showSearchEngineLink").addEventListener("click", (e) => {
         window.qBittorrent.Client.showSearchEngine(!window.qBittorrent.Client.isShowSearchEngine());
         LocalPreferences.set("show_search_engine", window.qBittorrent.Client.isShowSearchEngine().toString());
         updateTabDisplay();
     });
 
-    $("showRssReaderLink").addEvent("click", (e) => {
+    $("showRssReaderLink").addEventListener("click", (e) => {
         window.qBittorrent.Client.showRssReader(!window.qBittorrent.Client.isShowRssReader());
         LocalPreferences.set("show_rss_reader", window.qBittorrent.Client.isShowRssReader().toString());
         updateTabDisplay();
     });
 
-    $("showLogViewerLink").addEvent("click", (e) => {
+    $("showLogViewerLink").addEventListener("click", (e) => {
         window.qBittorrent.Client.showLogViewer(!window.qBittorrent.Client.isShowLogViewer());
         LocalPreferences.set("show_log_viewer", window.qBittorrent.Client.isShowLogViewer().toString());
         updateTabDisplay();
@@ -1165,7 +1165,7 @@ window.addEventListener("DOMContentLoaded", () => {
             $("mainWindowTabs").addClass("invisible");
     };
 
-    $("StatisticsLink").addEvent("click", StatisticsLinkFN);
+    $("StatisticsLink").addEventListener("click", StatisticsLinkFN);
 
     // main window tabs
 
@@ -1364,11 +1364,11 @@ window.addEventListener("DOMContentLoaded", () => {
             tabsOnload: function() {
                 MochaUI.initializeTabs("panelTabs");
 
-                $("logMessageLink").addEvent("click", (e) => {
+                $("logMessageLink").addEventListener("click", (e) => {
                     window.qBittorrent.Log.setCurrentTab("main");
                 });
 
-                $("logPeerLink").addEvent("click", (e) => {
+                $("logPeerLink").addEventListener("click", (e) => {
                     window.qBittorrent.Log.setCurrentTab("peer");
                 });
             },
@@ -1458,7 +1458,7 @@ window.addEventListener("DOMContentLoaded", () => {
                 }
             };
 
-            $("PropGeneralLink").addEvent("click", function(e) {
+            $("PropGeneralLink").addEventListener("click", function(e) {
                 $$(".propertiesTabContent").addClass("invisible");
                 $("prop_general").removeClass("invisible");
                 hideFilesFilter();
@@ -1466,7 +1466,7 @@ window.addEventListener("DOMContentLoaded", () => {
                 LocalPreferences.set("selected_tab", this.id);
             });
 
-            $("PropTrackersLink").addEvent("click", function(e) {
+            $("PropTrackersLink").addEventListener("click", function(e) {
                 $$(".propertiesTabContent").addClass("invisible");
                 $("prop_trackers").removeClass("invisible");
                 hideFilesFilter();
@@ -1474,7 +1474,7 @@ window.addEventListener("DOMContentLoaded", () => {
                 LocalPreferences.set("selected_tab", this.id);
             });
 
-            $("PropPeersLink").addEvent("click", function(e) {
+            $("PropPeersLink").addEventListener("click", function(e) {
                 $$(".propertiesTabContent").addClass("invisible");
                 $("prop_peers").removeClass("invisible");
                 hideFilesFilter();
@@ -1482,7 +1482,7 @@ window.addEventListener("DOMContentLoaded", () => {
                 LocalPreferences.set("selected_tab", this.id);
             });
 
-            $("PropWebSeedsLink").addEvent("click", function(e) {
+            $("PropWebSeedsLink").addEventListener("click", function(e) {
                 $$(".propertiesTabContent").addClass("invisible");
                 $("prop_webseeds").removeClass("invisible");
                 hideFilesFilter();
@@ -1490,7 +1490,7 @@ window.addEventListener("DOMContentLoaded", () => {
                 LocalPreferences.set("selected_tab", this.id);
             });
 
-            $("PropFilesLink").addEvent("click", function(e) {
+            $("PropFilesLink").addEventListener("click", function(e) {
                 $$(".propertiesTabContent").addClass("invisible");
                 $("prop_files").removeClass("invisible");
                 showFilesFilter();
@@ -1498,7 +1498,7 @@ window.addEventListener("DOMContentLoaded", () => {
                 LocalPreferences.set("selected_tab", this.id);
             });
 
-            $("propertiesPanel_collapseToggle").addEvent("click", (e) => {
+            $("propertiesPanel_collapseToggle").addEventListener("click", (e) => {
                 updatePropertiesPanel();
             });
         },
@@ -1516,21 +1516,21 @@ window.addEventListener("DOMContentLoaded", () => {
 
     // listen for changes to torrentsFilterInput
     let torrentsFilterInputTimer = -1;
-    $("torrentsFilterInput").addEvent("input", () => {
+    $("torrentsFilterInput").addEventListener("input", () => {
         clearTimeout(torrentsFilterInputTimer);
         torrentsFilterInputTimer = setTimeout(() => {
             torrentsFilterInputTimer = -1;
             torrentsTable.updateTable();
         }, window.qBittorrent.Misc.FILTER_INPUT_DELAY);
     });
-    $("torrentsFilterRegexBox").addEvent("change", () => {
+    $("torrentsFilterRegexBox").addEventListener("change", () => {
         torrentsTable.updateTable();
     });
 
-    $("transfersTabLink").addEvent("click", showTransfersTab);
-    $("searchTabLink").addEvent("click", showSearchTab);
-    $("rssTabLink").addEvent("click", showRssTab);
-    $("logTabLink").addEvent("click", showLogTab);
+    $("transfersTabLink").addEventListener("click", showTransfersTab);
+    $("searchTabLink").addEventListener("click", showSearchTab);
+    $("rssTabLink").addEventListener("click", showRssTab);
+    $("logTabLink").addEventListener("click", showLogTab);
     updateTabDisplay();
 
     const registerDragAndDrop = () => {
diff --git a/src/webui/www/private/scripts/contextmenu.js b/src/webui/www/private/scripts/contextmenu.js
index 3f8bc514e..75dbed0fa 100644
--- a/src/webui/www/private/scripts/contextmenu.js
+++ b/src/webui/www/private/scripts/contextmenu.js
@@ -112,8 +112,8 @@ window.qBittorrent.ContextMenu ??= (() => {
             });
 
             // position the menu
-            let xPosMenu = e.page.x + this.options.offsets.x;
-            let yPosMenu = e.page.y + this.options.offsets.y;
+            let xPosMenu = e.pageX + this.options.offsets.x;
+            let yPosMenu = e.pageY + this.options.offsets.y;
             if ((xPosMenu + this.menu.offsetWidth) > document.documentElement.clientWidth)
                 xPosMenu -= this.menu.offsetWidth;
             if ((yPosMenu + this.menu.offsetHeight) > document.documentElement.clientHeight)
@@ -156,19 +156,19 @@ window.qBittorrent.ContextMenu ??= (() => {
         },
 
         setupEventListeners: function(elem) {
-            elem.addEvent("contextmenu", (e) => {
+            elem.addEventListener("contextmenu", (e) => {
                 this.triggerMenu(e, elem);
             });
-            elem.addEvent("click", (e) => {
+            elem.addEventListener("click", (e) => {
                 this.hide();
             });
 
-            elem.addEvent("touchstart", (e) => {
+            elem.addEventListener("touchstart", (e) => {
                 this.hide();
                 this.touchStartAt = performance.now();
                 this.touchStartEvent = e;
             });
-            elem.addEvent("touchend", (e) => {
+            elem.addEventListener("touchend", (e) => {
                 const now = performance.now();
                 const touchStartAt = this.touchStartAt;
                 const touchStartEvent = this.touchStartEvent;
@@ -196,8 +196,10 @@ window.qBittorrent.ContextMenu ??= (() => {
                 return;
 
             // prevent default, if told to
-            if (this.options.stopEvent)
-                e.stop();
+            if (this.options.stopEvent) {
+                e.preventDefault();
+                e.stopPropagation();
+            }
             // record this as the trigger
             this.options.element = $(el);
             this.adjustMenuPosition(e);
@@ -214,7 +216,7 @@ window.qBittorrent.ContextMenu ??= (() => {
 
             /* menu items */
             this.menu.getElements("a").each(function(item) {
-                item.addEvent("click", (e) => {
+                item.addEventListener("click", (e) => {
                     e.preventDefault();
                     if (!item.hasClass("disabled")) {
                         this.execute(item.href.split("#")[1], $(this.options.element));
@@ -224,7 +226,7 @@ window.qBittorrent.ContextMenu ??= (() => {
             }, this);
 
             // hide on body click
-            $(document.body).addEvent("click", () => {
+            $(document.body).addEventListener("click", () => {
                 this.hide();
             });
         },
@@ -647,8 +649,8 @@ window.qBittorrent.ContextMenu ??= (() => {
                 top: "-999em"
             });
             // position the menu
-            let xPosMenu = e.page.x + this.options.offsets.x - $("rssdownloaderpage").offsetLeft;
-            let yPosMenu = e.page.y + this.options.offsets.y - $("rssdownloaderpage").offsetTop;
+            let xPosMenu = e.pageX + this.options.offsets.x - $("rssdownloaderpage").offsetLeft;
+            let yPosMenu = e.pageY + this.options.offsets.y - $("rssdownloaderpage").offsetTop;
             if ((xPosMenu + this.menu.offsetWidth) > document.documentElement.clientWidth)
                 xPosMenu -= this.menu.offsetWidth;
             if ((yPosMenu + this.menu.offsetHeight) > document.documentElement.clientHeight)
diff --git a/src/webui/www/private/scripts/dynamicTable.js b/src/webui/www/private/scripts/dynamicTable.js
index e3bab83f1..375497078 100644
--- a/src/webui/www/private/scripts/dynamicTable.js
+++ b/src/webui/www/private/scripts/dynamicTable.js
@@ -151,7 +151,7 @@ window.qBittorrent.DynamicTable ??= (() => {
 
             const mouseMoveFn = function(e) {
                 const brect = e.target.getBoundingClientRect();
-                const mouseXRelative = e.event.clientX - brect.left;
+                const mouseXRelative = e.clientX - brect.left;
                 if (this.currentHeaderAction === "") {
                     if ((brect.width - mouseXRelative) < 5) {
                         this.resizeTh = e.target;
@@ -201,7 +201,7 @@ window.qBittorrent.DynamicTable ??= (() => {
                     });
                 }
                 this.lastHoverTh = e.target;
-                this.lastClientX = e.event.clientX;
+                this.lastClientX = e.clientX;
             }.bind(this);
 
             const mouseOutFn = function(e) {
@@ -280,9 +280,9 @@ window.qBittorrent.DynamicTable ??= (() => {
 
             for (let i = 0; i < ths.length; ++i) {
                 const th = ths[i];
-                th.addEvent("mousemove", mouseMoveFn);
-                th.addEvent("mouseout", mouseOutFn);
-                th.addEvent("touchend", onTouch);
+                th.addEventListener("mousemove", mouseMoveFn);
+                th.addEventListener("mouseout", mouseOutFn);
+                th.addEventListener("touchend", onTouch);
                 th.makeResizable({
                     modifiers: {
                         x: "",
@@ -728,15 +728,17 @@ window.qBittorrent.DynamicTable ??= (() => {
                     tr["rowId"] = rowId;
 
                     tr._this = this;
-                    tr.addEvent("contextmenu", function(e) {
+                    tr.addEventListener("contextmenu", function(e) {
                         if (!this._this.isRowSelected(this.rowId)) {
                             this._this.deselectAll();
                             this._this.selectRow(this.rowId);
                         }
                         return true;
                     });
-                    tr.addEvent("click", function(e) {
-                        e.stop();
+                    tr.addEventListener("click", function(e) {
+                        e.preventDefault();
+                        e.stopPropagation();
+
                         if (e.control || e.meta) {
                             // CTRL/CMD ⌘ key was pressed
                             if (this._this.isRowSelected(this.rowId))
@@ -755,13 +757,13 @@ window.qBittorrent.DynamicTable ??= (() => {
                         }
                         return false;
                     });
-                    tr.addEvent("touchstart", function(e) {
+                    tr.addEventListener("touchstart", function(e) {
                         if (!this._this.isRowSelected(this.rowId)) {
                             this._this.deselectAll();
                             this._this.selectRow(this.rowId);
                         }
                     });
-                    tr.addEvent("keydown", function(event) {
+                    tr.addEventListener("keydown", function(event) {
                         switch (event.key) {
                             case "up":
                                 this._this.selectPreviousRow();
@@ -1523,8 +1525,10 @@ window.qBittorrent.DynamicTable ??= (() => {
         },
 
         setupTr: function(tr) {
-            tr.addEvent("dblclick", function(e) {
-                e.stop();
+            tr.addEventListener("dblclick", function(e) {
+                e.preventDefault();
+                e.stopPropagation();
+
                 this._this.deselectAll();
                 this._this.selectRow(this.rowId);
                 const row = this._this.rows.get(this.rowId);
@@ -2030,7 +2034,7 @@ window.qBittorrent.DynamicTable ??= (() => {
                 checkbox.id = "cbRename" + id;
                 checkbox.setAttribute("data-id", id);
                 checkbox.className = "RenamingCB";
-                checkbox.addEvent("click", (e) => {
+                checkbox.addEventListener("click", (e) => {
                     const node = that.getNode(id);
                     node.checked = e.target.checked ? 0 : 1;
                     node.full_data.checked = node.checked;
@@ -2248,7 +2252,7 @@ window.qBittorrent.DynamicTable ??= (() => {
         },
 
         setupTr: function(tr) {
-            tr.addEvent("keydown", function(event) {
+            tr.addEventListener("keydown", function(event) {
                 switch (event.key) {
                     case "left":
                         qBittorrent.PropFiles.collapseFolder(this._this.getSelectedRowId());
@@ -2578,7 +2582,7 @@ window.qBittorrent.DynamicTable ??= (() => {
         },
 
         setupTr: function(tr) {
-            tr.addEvent("keydown", function(event) {
+            tr.addEventListener("keydown", function(event) {
                 switch (event.key) {
                     case "left":
                         qBittorrent.PropFiles.collapseFolder(this._this.getSelectedRowId());
@@ -2630,7 +2634,7 @@ window.qBittorrent.DynamicTable ??= (() => {
             window.qBittorrent.Rss.showRssFeed(path);
         },
         setupTr: function(tr) {
-            tr.addEvent("dblclick", function(e) {
+            tr.addEventListener("dblclick", function(e) {
                 if (this.rowId !== 0) {
                     window.qBittorrent.Rss.moveItem(this._this.rows.get(this.rowId).full_data.dataPath);
                     return true;
@@ -2738,7 +2742,7 @@ window.qBittorrent.DynamicTable ??= (() => {
                 $(this.dynamicTableFixedHeaderDivId).getElements("table")[0].style.left = -$(this.dynamicTableDivId).scrollLeft + "px";
             }.bind(this);
 
-            $(this.dynamicTableDivId).addEvent("scroll", scrollFn);
+            $(this.dynamicTableDivId).addEventListener("scroll", scrollFn);
         }
     });
 
@@ -2771,7 +2775,7 @@ window.qBittorrent.DynamicTable ??= (() => {
             window.qBittorrent.Rss.showDetails(feedUid, articleId);
         },
         setupTr: function(tr) {
-            tr.addEvent("dblclick", function(e) {
+            tr.addEventListener("dblclick", function(e) {
                 showDownloadPage([this._this.rows.get(this.rowId).full_data.torrentURL]);
                 return true;
             });
@@ -2833,7 +2837,7 @@ window.qBittorrent.DynamicTable ??= (() => {
                 $(this.dynamicTableFixedHeaderDivId).getElements("table")[0].style.left = -$(this.dynamicTableDivId).scrollLeft + "px";
             }.bind(this);
 
-            $(this.dynamicTableDivId).addEvent("scroll", scrollFn);
+            $(this.dynamicTableDivId).addEventListener("scroll", scrollFn);
         }
     });
 
@@ -2850,7 +2854,7 @@ window.qBittorrent.DynamicTable ??= (() => {
                     checkbox.id = "cbRssDlRule" + row.rowId;
                     checkbox.checked = row.full_data.checked;
 
-                    checkbox.addEvent("click", function(e) {
+                    checkbox.addEventListener("click", function(e) {
                         window.qBittorrent.RssDownloader.rssDownloaderRulesTable.updateRowData({
                             rowId: row.rowId,
                             checked: this.checked
@@ -2872,7 +2876,7 @@ window.qBittorrent.DynamicTable ??= (() => {
             return this.rows.getValues();
         },
         setupTr: function(tr) {
-            tr.addEvent("dblclick", function(e) {
+            tr.addEventListener("dblclick", function(e) {
                 window.qBittorrent.RssDownloader.renameRule(this._this.rows.get(this.rowId).full_data.name);
                 return true;
             });
@@ -2943,7 +2947,7 @@ window.qBittorrent.DynamicTable ??= (() => {
                     checkbox.id = "cbRssDlFeed" + row.rowId;
                     checkbox.checked = row.full_data.checked;
 
-                    checkbox.addEvent("click", function(e) {
+                    checkbox.addEventListener("click", function(e) {
                         window.qBittorrent.RssDownloader.rssDownloaderFeedSelectionTable.updateRowData({
                             rowId: row.rowId,
                             checked: this.checked
diff --git a/src/webui/www/private/scripts/mocha-init.js b/src/webui/www/private/scripts/mocha-init.js
index c36dcaa5e..9dc168fab 100644
--- a/src/webui/www/private/scripts/mocha-init.js
+++ b/src/webui/www/private/scripts/mocha-init.js
@@ -111,12 +111,13 @@ const initializeWindows = function() {
     function addClickEvent(el, fn) {
         ["Link", "Button"].each((item) => {
             if ($(el + item))
-                $(el + item).addEvent("click", fn);
+                $(el + item).addEventListener("click", fn);
         });
     }
 
     addClickEvent("download", (e) => {
-        new Event(e).stop();
+        e.preventDefault();
+        e.stopPropagation();
         showDownloadPage();
     });
 
@@ -148,7 +149,9 @@ const initializeWindows = function() {
     };
 
     addClickEvent("preferences", (e) => {
-        new Event(e).stop();
+        e.preventDefault();
+        e.stopPropagation();
+
         const id = "preferencesPage";
         new MochaUI.Window({
             id: id,
@@ -173,7 +176,9 @@ const initializeWindows = function() {
     });
 
     addClickEvent("upload", (e) => {
-        new Event(e).stop();
+        e.preventDefault();
+        e.stopPropagation();
+
         const id = "uploadPage";
         new MochaUI.Window({
             id: id,
@@ -399,7 +404,8 @@ const initializeWindows = function() {
     };
 
     addClickEvent("delete", (e) => {
-        new Event(e).stop();
+        e.preventDefault();
+        e.stopPropagation();
         deleteFN();
     });
 
@@ -1070,7 +1076,8 @@ const initializeWindows = function() {
     };
 
     addClickEvent("stopAll", (e) => {
-        new Event(e).stop();
+        e.preventDefault();
+        e.stopPropagation();
 
         if (confirm("QBT_TR(Would you like to stop all torrents?)QBT_TR[CONTEXT=MainWindow]")) {
             new Request({
@@ -1085,7 +1092,8 @@ const initializeWindows = function() {
     });
 
     addClickEvent("startAll", (e) => {
-        new Event(e).stop();
+        e.preventDefault();
+        e.stopPropagation();
 
         if (confirm("QBT_TR(Would you like to start all torrents?)QBT_TR[CONTEXT=MainWindow]")) {
             new Request({
@@ -1101,7 +1109,9 @@ const initializeWindows = function() {
 
     ["stop", "start", "recheck"].each((item) => {
         addClickEvent(item, (e) => {
-            new Event(e).stop();
+            e.preventDefault();
+            e.stopPropagation();
+
             const hashes = torrentsTable.selectedRowsIds();
             if (hashes.length) {
                 hashes.each((hash, index) => {
@@ -1120,7 +1130,8 @@ const initializeWindows = function() {
 
     ["decreasePrio", "increasePrio", "topPrio", "bottomPrio"].each((item) => {
         addClickEvent(item, (e) => {
-            new Event(e).stop();
+            e.preventDefault();
+            e.stopPropagation();
             setQueuePositionFN(item);
         });
     });
@@ -1140,7 +1151,9 @@ const initializeWindows = function() {
     };
 
     addClickEvent("about", (e) => {
-        new Event(e).stop();
+        e.preventDefault();
+        e.stopPropagation();
+
         const id = "aboutpage";
         new MochaUI.Window({
             id: id,
@@ -1162,7 +1175,9 @@ const initializeWindows = function() {
     });
 
     addClickEvent("logout", (e) => {
-        new Event(e).stop();
+        e.preventDefault();
+        e.stopPropagation();
+
         new Request({
             url: "api/v2/auth/logout",
             method: "post",
@@ -1173,7 +1188,9 @@ const initializeWindows = function() {
     });
 
     addClickEvent("shutdown", (e) => {
-        new Event(e).stop();
+        e.preventDefault();
+        e.stopPropagation();
+
         if (confirm("QBT_TR(Are you sure you want to quit qBittorrent?)QBT_TR[CONTEXT=MainWindow]")) {
             new Request({
                 url: "api/v2/app/shutdown",
@@ -1191,8 +1208,9 @@ const initializeWindows = function() {
 
     // Deactivate menu header links
     $$("a.returnFalse").each((el) => {
-        el.addEvent("click", (e) => {
-            new Event(e).stop();
+        el.addEventListener("click", (e) => {
+            e.preventDefault();
+            e.stopPropagation();
         });
     });
 };
diff --git a/src/webui/www/private/scripts/prop-files.js b/src/webui/www/private/scripts/prop-files.js
index b2da0bec7..d8111e2d5 100644
--- a/src/webui/www/private/scripts/prop-files.js
+++ b/src/webui/www/private/scripts/prop-files.js
@@ -136,7 +136,7 @@ window.qBittorrent.PropFiles ??= (() => {
         checkbox.setAttribute("data-id", id);
         checkbox.setAttribute("data-file-id", fileId);
         checkbox.className = "DownloadedCB";
-        checkbox.addEvent("click", fileCheckboxClicked);
+        checkbox.addEventListener("click", fileCheckboxClicked);
 
         updateCheckbox(checkbox, checked);
         return checkbox;
@@ -180,7 +180,7 @@ window.qBittorrent.PropFiles ??= (() => {
         select.setAttribute("data-id", id);
         select.setAttribute("data-file-id", fileId);
         select.addClass("combo_priority");
-        select.addEvent("change", fileComboboxChanged);
+        select.addEventListener("change", fileComboboxChanged);
 
         createPriorityOptionElement(FilePriority.Ignored, (FilePriority.Ignored === selectedPriority), "QBT_TR(Do not download)QBT_TR[CONTEXT=PropListDelegate]").injectInside(select);
         createPriorityOptionElement(FilePriority.Normal, (FilePriority.Normal === selectedPriority), "QBT_TR(Normal)QBT_TR[CONTEXT=PropListDelegate]").injectInside(select);
@@ -625,7 +625,7 @@ window.qBittorrent.PropFiles ??= (() => {
         const checkbox = new Element("input");
         checkbox.type = "checkbox";
         checkbox.id = "tristate_cb";
-        checkbox.addEvent("click", switchCheckboxState);
+        checkbox.addEventListener("click", switchCheckboxState);
 
         const checkboxTH = tableHeaders[0];
         checkbox.injectInside(checkboxTH);
@@ -637,7 +637,7 @@ window.qBittorrent.PropFiles ??= (() => {
 
     // listen for changes to torrentFilesFilterInput
     let torrentFilesFilterInputTimer = -1;
-    $("torrentFilesFilterInput").addEvent("input", () => {
+    $("torrentFilesFilterInput").addEventListener("input", () => {
         clearTimeout(torrentFilesFilterInputTimer);
 
         const value = $("torrentFilesFilterInput").value;
diff --git a/src/webui/www/private/scripts/search.js b/src/webui/www/private/scripts/search.js
index 222481526..c02fcfcf2 100644
--- a/src/webui/www/private/scripts/search.js
+++ b/src/webui/www/private/scripts/search.js
@@ -107,7 +107,7 @@ window.qBittorrent.Search ??= (() => {
 
         // listen for changes to searchInNameFilter
         let searchInNameFilterTimer = -1;
-        $("searchInNameFilter").addEvent("input", () => {
+        $("searchInNameFilter").addEventListener("input", () => {
             clearTimeout(searchInNameFilterTimer);
             searchInNameFilterTimer = setTimeout(() => {
                 searchInNameFilterTimer = -1;
@@ -123,7 +123,8 @@ window.qBittorrent.Search ??= (() => {
             events: {
                 "Enter": function(e) {
                     // accept enter key as a click
-                    new Event(e).stop();
+                    e.preventDefault();
+                    e.stopPropagation();
 
                     const elem = e.event.srcElement;
                     if (elem.className.contains("searchInputField")) {
@@ -159,6 +160,7 @@ window.qBittorrent.Search ??= (() => {
         const tabElem = new Element("a", {
             text: pattern,
         });
+
         const closeTabElem = new Element("img", {
             alt: "QBT_TR(Close tab)QBT_TR[CONTEXT=SearchWidget]",
             title: "QBT_TR(Close tab)QBT_TR[CONTEXT=SearchWidget]",
@@ -166,15 +168,22 @@ window.qBittorrent.Search ??= (() => {
             width: "8",
             height: "8",
             style: "padding-right: 7px; margin-bottom: -1px; margin-left: -5px",
-            onclick: "qBittorrent.Search.closeSearchTab(this)",
+            onclick: "qBittorrent.Search.closeSearchTab(event, this);",
         });
         closeTabElem.inject(tabElem, "top");
+
         tabElem.appendChild(getStatusIconElement("QBT_TR(Searching...)QBT_TR[CONTEXT=SearchJobWidget]", "images/queued.svg"));
-        $("searchTabs").appendChild(new Element("li", {
+
+        const liElement = new Element("li", {
             id: newTabId,
             class: "selected",
             html: tabElem.outerHTML,
-        }));
+        });
+        liElement.addEventListener("click", (e) => {
+            setActiveTab(liElement);
+            $("startSearchButton").textContent = "QBT_TR(Search)QBT_TR[CONTEXT=SearchEngineWidget]";
+        });
+        $("searchTabs").appendChild(liElement);
 
         // unhide the results elements
         if (numSearchTabs() >= 1) {
@@ -184,15 +193,8 @@ window.qBittorrent.Search ??= (() => {
             $("searchTabsToolbar").style.display = "block";
         }
 
-        // reinitialize tabs
-        $("searchTabs").getElements("li").removeEvents("click");
-        $("searchTabs").getElements("li").addEvent("click", function(e) {
-            $("startSearchButton").textContent = "QBT_TR(Search)QBT_TR[CONTEXT=SearchEngineWidget]";
-            setActiveTab(this);
-        });
-
         // select new tab
-        setActiveTab($(newTabId));
+        setActiveTab(liElement);
 
         searchResultsTable.clear();
         resetFilters();
@@ -213,11 +215,13 @@ window.qBittorrent.Search ??= (() => {
         updateSearchResultsData(searchId);
     };
 
-    const closeSearchTab = function(el) {
+    const closeSearchTab = function(e, el) {
+        e.stopPropagation();
+
         const tab = el.parentElement.parentElement;
         const searchId = getSearchIdFromTab(tab);
         const isTabSelected = tab.hasClass("selected");
-        const newTabToSelect = isTabSelected ? tab.nextSibling || tab.previousSibling : null;
+        const newTabToSelect = isTabSelected ? (tab.nextSibling || tab.previousSibling) : null;
 
         const currentSearchId = getSelectedSearchId();
         const state = searchState.get(currentSearchId);
@@ -388,7 +392,7 @@ window.qBittorrent.Search ??= (() => {
                 category: category,
                 plugins: plugins
             },
-            onSuccess: function(response) {
+            onSuccess: (response) => {
                 $("startSearchButton").textContent = "QBT_TR(Stop)QBT_TR[CONTEXT=SearchEngineWidget]";
                 const searchId = response.id;
                 createSearchTab(searchId, pattern);
diff --git a/src/webui/www/private/setlocation.html b/src/webui/www/private/setlocation.html
index 25b42e55c..57aced981 100644
--- a/src/webui/www/private/setlocation.html
+++ b/src/webui/www/private/setlocation.html
@@ -29,7 +29,7 @@
             }
         }).activate();
 
-        window.addEvent("domready", () => {
+        window.addEventListener("DOMContentLoaded", () => {
             const path = new URI().getData("path");
 
             // set text field to current value
@@ -37,13 +37,15 @@
                 $("setLocation").value = decodeURIComponent(path);
 
             $("setLocation").focus();
-            $("setLocationButton").addEvent("click", (e) => {
-                new Event(e).stop();
+            $("setLocationButton").addEventListener("click", (e) => {
+                e.preventDefault();
+                e.stopPropagation();
+
                 // check field
                 const location = $("setLocation").value.trim();
                 if ((location === null) || (location === "")) {
                     $("error_div").textContent = "QBT_TR(Save path is empty)QBT_TR[CONTEXT=TorrentsController]";
-                    return false;
+                    return;
                 }
 
                 const hashesList = new URI().getData("hashes");
diff --git a/src/webui/www/private/shareratio.html b/src/webui/www/private/shareratio.html
index 673f7cd62..95d79fb3e 100644
--- a/src/webui/www/private/shareratio.html
+++ b/src/webui/www/private/shareratio.html
@@ -32,7 +32,7 @@
             }
         }).activate();
 
-        window.addEvent("domready", () => {
+        window.addEventListener("DOMContentLoaded", () => {
             const hashesList = new URI().getData("hashes").split("|");
             const origValues = new URI().getData("orig").split("|");
 
@@ -76,11 +76,12 @@
             shareLimitChanged();
 
             $("default").focus();
-            $("save").addEvent("click", (e) => {
-                new Event(e).stop();
+            $("save").addEventListener("click", (e) => {
+                e.preventDefault();
+                e.stopPropagation();
 
                 if (!isFormValid())
-                    return false;
+                    return;
 
                 const shareLimit = getSelectedRadioValue("shareLimit");
                 let ratioLimitValue = 0.00;
@@ -99,7 +100,7 @@
                     inactiveSeedingTimeLimitValue = $("setInactiveMinutes").checked ? $("inactiveMinutes").value : -1;
                 }
                 else {
-                    return false;
+                    return;
                 }
 
                 new Request({
diff --git a/src/webui/www/private/views/aboutToolbar.html b/src/webui/www/private/views/aboutToolbar.html
index 771645098..b95e8ed48 100644
--- a/src/webui/www/private/views/aboutToolbar.html
+++ b/src/webui/www/private/views/aboutToolbar.html
@@ -16,32 +16,32 @@
     (function() {
         MochaUI.initializeTabs("aboutTabs");
 
-        $("aboutAboutLink").addEvent("click", () => {
+        $("aboutAboutLink").addEventListener("click", () => {
             $$(".aboutTabContent").addClass("invisible");
             $("aboutAboutContent").removeClass("invisible");
         });
 
-        $("aboutAuthorLink").addEvent("click", () => {
+        $("aboutAuthorLink").addEventListener("click", () => {
             $$(".aboutTabContent").addClass("invisible");
             $("aboutAuthorContent").removeClass("invisible");
         });
 
-        $("aboutSpecialThanksLink").addEvent("click", () => {
+        $("aboutSpecialThanksLink").addEventListener("click", () => {
             $$(".aboutTabContent").addClass("invisible");
             $("aboutSpecialThanksContent").removeClass("invisible");
         });
 
-        $("aboutTranslatorsLink").addEvent("click", () => {
+        $("aboutTranslatorsLink").addEventListener("click", () => {
             $$(".aboutTabContent").addClass("invisible");
             $("aboutTranslatorsContent").removeClass("invisible");
         });
 
-        $("aboutLicenseLink").addEvent("click", () => {
+        $("aboutLicenseLink").addEventListener("click", () => {
             $$(".aboutTabContent").addClass("invisible");
             $("aboutLicenseContent").removeClass("invisible");
         });
 
-        $("aboutSoftwareUsedLink").addEvent("click", () => {
+        $("aboutSoftwareUsedLink").addEventListener("click", () => {
             $$(".aboutTabContent").addClass("invisible");
             $("aboutSoftwareUsedContent").removeClass("invisible");
         });
diff --git a/src/webui/www/private/views/installsearchplugin.html b/src/webui/www/private/views/installsearchplugin.html
index 3752eb2ce..8445e0ca8 100644
--- a/src/webui/www/private/views/installsearchplugin.html
+++ b/src/webui/www/private/views/installsearchplugin.html
@@ -43,7 +43,8 @@
                 events: {
                     "Enter": function(e) {
                         // accept enter key as a click
-                        new Event(e).stop();
+                        e.preventDefault();
+                        e.stopPropagation();
 
                         const elem = e.event.srcElement;
                         if ((elem.id === "newPluginPath") || (elem.id === "newPluginOk"))
diff --git a/src/webui/www/private/views/preferences.html b/src/webui/www/private/views/preferences.html
index 2e2bcbbb8..702dda010 100644
--- a/src/webui/www/private/views/preferences.html
+++ b/src/webui/www/private/views/preferences.html
@@ -2975,7 +2975,7 @@ Use ';' to split multiple entries. Can use wildcard '*'.)QBT_TR[CONTEXT=OptionsD
             if ((buildInfo.platform !== "macos") && (buildInfo.platform !== "windows"))
                 $("rowMarkOfTheWeb").style.display = "none";
 
-            $("networkInterface").addEvent("change", function() {
+            $("networkInterface").addEventListener("change", function() {
                 updateInterfaceAddresses($(this).value, "");
             });
 
diff --git a/src/webui/www/private/views/preferencesToolbar.html b/src/webui/www/private/views/preferencesToolbar.html
index 0491242f0..eda733377 100644
--- a/src/webui/www/private/views/preferencesToolbar.html
+++ b/src/webui/www/private/views/preferencesToolbar.html
@@ -20,35 +20,35 @@
         // Tabs
         MochaUI.initializeTabs("preferencesTabs");
 
-        $("PrefBehaviorLink").addEvent("click", (e) => {
+        $("PrefBehaviorLink").addEventListener("click", (e) => {
             $$(".PrefTab").addClass("invisible");
             $("BehaviorTab").removeClass("invisible");
         });
-        $("PrefDownloadsLink").addEvent("click", (e) => {
+        $("PrefDownloadsLink").addEventListener("click", (e) => {
             $$(".PrefTab").addClass("invisible");
             $("DownloadsTab").removeClass("invisible");
         });
-        $("PrefConnectionLink").addEvent("click", (e) => {
+        $("PrefConnectionLink").addEventListener("click", (e) => {
             $$(".PrefTab").addClass("invisible");
             $("ConnectionTab").removeClass("invisible");
         });
-        $("PrefSpeedLink").addEvent("click", (e) => {
+        $("PrefSpeedLink").addEventListener("click", (e) => {
             $$(".PrefTab").addClass("invisible");
             $("SpeedTab").removeClass("invisible");
         });
-        $("PrefBittorrentLink").addEvent("click", (e) => {
+        $("PrefBittorrentLink").addEventListener("click", (e) => {
             $$(".PrefTab").addClass("invisible");
             $("BittorrentTab").removeClass("invisible");
         });
-        $("PrefRSSLink").addEvent("click", (e) => {
+        $("PrefRSSLink").addEventListener("click", (e) => {
             $$(".PrefTab").addClass("invisible");
             $("RSSTab").removeClass("invisible");
         });
-        $("PrefWebUILink").addEvent("click", (e) => {
+        $("PrefWebUILink").addEventListener("click", (e) => {
             $$(".PrefTab").addClass("invisible");
             $("WebUITab").removeClass("invisible");
         });
-        $("PrefAdvancedLink").addEvent("click", (e) => {
+        $("PrefAdvancedLink").addEventListener("click", (e) => {
             $$(".PrefTab").addClass("invisible");
             $("AdvancedTab").removeClass("invisible");
         });
diff --git a/src/webui/www/private/views/rssDownloader.html b/src/webui/www/private/views/rssDownloader.html
index 4271da911..f5184faf2 100644
--- a/src/webui/www/private/views/rssDownloader.html
+++ b/src/webui/www/private/views/rssDownloader.html
@@ -473,7 +473,7 @@ Supports the formats: S01E01, 1x1, 2017.12.31 and 31.12.2017 (Date formats also
                     flatten(response);
                 }
             }).send();
-            $("savetoDifferentDir").addEvent("click", () => {
+            $("savetoDifferentDir").addEventListener("click", () => {
                 $("saveToText").disabled = !$("savetoDifferentDir").checked;
             });
             updateRulesList();