[Bug]: Major performance issue while loading new pages

[Carbocode]

Pre-Submission Checklist

• [X] I have checked the existing/closed issues to ensure this issue has not already been reported.
• [x] I am using the latest supported version of the browser.
• [X] I have tried disabling all browser extensions/add-ons to rule out interference from these.
• [X] I have tried clearing the browser cache and cookies.
• [X] I have checked with a new profile and the issue still occurs.
• [X] I have provided detailed step-by-step instructions on how to reproduce the issue.
• [X] I have included relevant screenshots or console outputs.
• [X] I have checked that this problem is not occurring in the latest version of Firefox ESR.
• [X] This issue is specific to this browser and does not occur in other browsers.

Bug Summary

When opening a new tab, the browser's CPU usage spikes to 170-180%, causing the entire browser to freeze and other open pages to crash.

Reproduction Steps

1. Opening a web page
2. Waiting for the crash

Expected Behavior

Loading the website without issues

Actual Behavior

When opening a new tab or launching an extension (Bitwarden), the browser's CPU usage spikes to 170-180%, causing the entire browser to freeze and other open pages to crash, making the browser impossible to use.

Normally, my browser and computer handle multiple heavy tabs without any slowdowns or bugs.

Few days ago, a similar issue occurred with Workspaces, which drastically slowed down page loading. However, the issue stopped once Workspaces were disabled.

Screenshots

Browser Version

11.18.0 (64-bit)

Operating System

MacOS Ventura

Additional Context

PC: Mac M2 Extensions: Bitwarden, uBlockOrigin, CanvasBlocker, SkipRedirect, SmartRefer, MultiAccount Container