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@notDavid
Last active January 19, 2024 20:17
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A userscript to prevent websites from hijacking browser keyboard shortcuts
// ==UserScript==
// @name Prevent keyboard shortcut hijacking
// @description Prevent websites to hijack keyboard shortcuts, for example <Ctrl+F> on Discourse
// @namespace Violentmonkey Scripts
// @match *://*/*
// @grant none
// @version 1.0
// @author notDavid
// ==/UserScript==
(window.opera ? document.body : document).addEventListener('keydown', function(e) {
//alert(e.keyCode ); //uncomment to find more keyCodes
var OS="Unknown";
if (navigator.appVersion.toUpperCase().indexOf("MAC")>=0) OS="macOS";
//if (navigator.appVersion.toUpperCase().indexOf("LINUX")>=0) OS="Linux";
//if (navigator.appVersion.toUpperCase().indexOf("X11")>=0) OS="UNIX";
//if (navigator.appVersion.toUpperCase().indexOf("WIN")>=0) OS="Windows";
//console.log(OS);
// macOS uses the Command key, identified as metaKey
// Windows and Linux use the Control key, identified as ctrlKey
//var modifier = (OS == "macOS") ? e.metaKey : e.ctrlKey;
var modifier_cmd = e.metaKey;
var modifier_ctrl = e.ctrlKey;
if (e.keyCode === 116) {
// F5 should never be captured
e.stopImmediatePropagation();
return;
}
// abort if modifier isn't pressed
if (modifier_cmd || modifier_ctrl) {
if (modifier_ctrl) {
switch (e.keyCode) {
case 70: // f - find
e.stopImmediatePropagation();
return;
}
}
if ((OS == "macOS") && (modifier_cmd)) {
switch (e.keyCode) {
case 188: // , - settings
case 82: // r - reload
case 70: // f - find (Discourse)
e.stopImmediatePropagation();
return;
}
}
}
}, true);
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