1749925 - Firefox cannot connect to websites; runs at 100% CPU

Status: VERIFIED DUPLICATE of bug 1749910

(Core :: Networking, defect, P1)

Description

[Roman]

Attachment: firefox.txt

User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/15.2 Safari/605.1.15

Steps to reproduce:

I just opened a new tab and suddenly, Firefox could not open any website anymore.

Actual results:

Refreshing existing tabs and opening new tabs... all just went into loading state and nothing happened. The network console shows that the request is sent, but there seems to be no response. The Firefox process consumes 100% of the CPU. Other browsers (Safari, Chrome) work.
I am attaching a file created by the macOS task manager.

Restarting Firefox, the OS and even using a fresh new profile did not fix the problem.

Expected results:

Well, the expectation was to view websites.

Comment 1

[BugBot [:suhaib / :marco]]

The Bugbug bot thinks this bug should belong to the 'DevTools::Netmonitor' component, and is moving the bug to that component. Please revert this change in case you think the bot is wrong.