Fixes ChatGPT failing to load when you open several tabs. Some sessions crash because of bad `Performance.measure` calls used for analytics. This script safely overrides `Performance.measure`, skipping invalid calls so the site loads normally while leaving your experience unchanged. Fully commented; questions and feedback welcome.
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// ==UserScript==
// @name Fix ChatGPT not loading in multiple tabs (due to Performance.measure Error)
// @namespace 12centuries
// @version 0.1
// @description Fixes ChatGPT failing to load when you open several tabs. Some sessions crash because of bad `Performance.measure` calls used for analytics. This script safely overrides `Performance.measure`, skipping invalid calls so the site loads normally while leaving your experience unchanged. Fully commented; questions and feedback welcome.
// @author 12centuries
// @license MIT
// @match *://chatgpt.com/*
// @grant none
// ==/UserScript==
(function() {
'use strict';
// Override the Performance.measure function
if (window.performance && typeof window.performance.measure === 'function') {
const originalMeasure = window.performance.measure;
window.performance.measure = function(measureName, startMark, endMark) {
try {
// Check if the 'end' attribute (endMark) is negative
// or any other condition that causes the specific TypeError
if (typeof endMark === 'number' && endMark < 0) {
console.warn(`Userscript intercepted problematic Performance.measure call for: ${measureName}. End mark was negative.`);
return; // Skip the problematic call
}
// Call the original function if the values are valid
originalMeasure.call(this, measureName, startMark, endMark);
} catch (e) {
if (e instanceof TypeError && e.message.includes('Given attribute end cannot be negative')) {
console.warn(`Userscript caught and suppressed TypeError in Performance.measure for: ${measureName}`);
// Suppress the error and continue
} else {
throw e; // Re-throw other errors
}
}
};
}
})();