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Userscript: Stop websites from hijacking keyboard shortcuts.
// ==UserScript==
// @name Disable website keyboard hooks
// @description Stop websites from hijacking keyboard shortcuts.
// @author Isaac Levy
// @run-at document-start
// @include *
// @grant none
// @version 0.0.1
// @namespace https://isaacrlevy.com
// ==/UserScript==
var keycodes = [ // Add keycodes as desired, keep sorted.
37, 38, 39, 40 // Arrow keys.
]
var meta_keycodes = [ // Disable these when meta key is pressed.
70
];
// Don't change below this line.
var isMac = navigator.platform.toLowerCase().indexOf('mac') >= 0;
// Create a fast lookup.
// This saves work during normal typing. Maybe unnecessary.
var keycode_offset = keycodes[0];
var keycode_arr = Array(keycodes[keycodes.length - 1] - keycode_offset)
for (var i = 0, len = keycodes.length; i < len; i++) {
keycode_arr[keycodes[i] - keycode_offset] = true;
}
document.addEventListener('keydown', function(e) {
//console.log(e);
if ((isMac && e.metaKey) || (!isMac && e.ctrlKey)) {
if (meta_keycodes.indexOf(e.keyCode) >= 0) {
e.stopImmediatePropagation();
}
} else if (keycode_arr[e.keyCode - keycode_offset]) {
e.stopImmediatePropagation();
}
return false;
});
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