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43 lines
1.2 KiB
JavaScript
43 lines
1.2 KiB
JavaScript
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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"use strict";
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/**
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* Bugs 1881922, 1901780 - Disable legacy DOM Mutation Events to prevent performance issues.
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*/
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/* globals exportFunction */
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let bug = "1881922";
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if (location.origin.includes("vanbreda")) {
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bug = "1901780";
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}
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console.info(
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`DOM Mutation Events have been disabled to prevent performance issues. See https://bugzilla.mozilla.org/show_bug.cgi?id=${bug} for details.`
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);
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(function disableMutationEvents() {
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const whichEvents = [
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"domattrmodified",
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"domcharacterdatamodified",
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"domnodeinserted",
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"domnodeinsertedintodocument",
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"domnoderemoved",
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"domnoderemovedfromdocument",
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"domsubtreemodified",
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];
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const { prototype } = window.wrappedJSObject.EventTarget;
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const { addEventListener } = prototype;
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Object.defineProperty(prototype, "addEventListener", {
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value: exportFunction(function (_type, b, c, d) {
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const type = _type?.toLowerCase();
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if (whichEvents.includes(type)) {
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return undefined;
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}
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return addEventListener.call(this, type, b, c, d);
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}, window),
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});
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})();
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