Fix ChatGPT not loading in multiple tabs (due to Performance.measure Error)

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.

You will need to install an extension such as Tampermonkey, Greasemonkey or Violentmonkey to install this script.

You will need to install an extension such as Tampermonkey to install this script.

You will need to install an extension such as Tampermonkey or Violentmonkey to install this script.

You will need to install an extension such as Tampermonkey or Userscripts to install this script.

You will need to install an extension such as Tampermonkey to install this script.

You will need to install a user script manager extension to install this script.

(I already have a user script manager, let me install it!)

You will need to install an extension such as Stylus to install this style.

You will need to install an extension such as Stylus to install this style.

You will need to install an extension such as Stylus to install this style.

You will need to install a user style manager extension to install this style.

You will need to install a user style manager extension to install this style.

You will need to install a user style manager extension to install this style.

(I already have a user style manager, let me install it!)

// ==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
                }
            }
        };
    }
})();