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39 lines
1.3 KiB
JavaScript
39 lines
1.3 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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* Bug 1842437 - When attempting to go back on youtube.com, the content remains the same
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*
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* If consecutive session history entries had history.state.entryTime set to same value,
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* back button doesn't work as expected. The entryTime value is coming from performance.now()
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* and modifying its return value slightly to make sure two close consecutive calls don't
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* get the same result helped with resolving the issue.
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*/
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/* globals exportFunction */
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console.info(
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"performance.now precision has been modified for compatibility reasons. See https://bugzilla.mozilla.org/show_bug.cgi?id=1756970 for details."
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);
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const origPerf = performance.wrappedJSObject;
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const origNow = origPerf.now;
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let counter = 0;
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let previousVal = 0;
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Object.defineProperty(window.performance.wrappedJSObject, "now", {
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value: exportFunction(function () {
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let originalVal = origNow.call(origPerf);
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if (originalVal === previousVal) {
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originalVal += 0.00000003 * ++counter;
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} else {
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previousVal = originalVal;
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counter = 0;
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}
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return originalVal;
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}, window),
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});
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