facebook freezes firefox 150.0.3

On what system? etc. . . .

PC Windows 11. Updated to 151.0.3 but the issue persists.

Do you have any VPN or security software that would interfere with connections to turn off? (Any antivirus or malware/phishing protections with "safe web" or "https scanning" features?)

To rule out any addons, I'd restart into Use Troubleshoot Mode in Firefox and follow the steps to verify any impact.

No VPN or software that would interfere with connections.

Freeze means high CPU/memory loads, resources drained, slowing down the whole PC, can't switch or close tabs etc.?

Or the UI and everything is normal, snappy, just the content inside the pages is not loading… or loading very slowly… or with errors… timelines with placeholders, images loading only halfway or not at all etc.?

Only the website and firefox freezes. Have to use task manager to close firefox.

Hi, have you already tried Troubleshoot Mode as Jan suggested above?

Tried, didn't help.

Could you try logging in from a Private Window, or a separate new profile to test how the site renders without any previous data? (Or, try downloading Firefox Nightly nightly.mozilla.org if you don't have one yet, that'll come with its own clean slate separate profile to compare.)

Private Window still freezes.

The only known conflict reported in the past few weeks is with Avast antivirus (that stalls the QUIC/HTTP3 connections), and also people with Bitdefender reported "slow loading" esp. of media — but none of that meant the whole browser was brought to a halt and basically unresponsive.

Dave, realistically you might wanna file that in bugzilla and some of the engineers will walk you through the logging steps etc. to help them surface what's happening.

Expecting these were not crashes but hangs, there won't be interesting crash reports for that. Maybe if you manage to capture a profile profiler.firefox.com somehow before the whole app gets unresponsive, that might help shed some light on what's that special for your case.

If you believe this was not an issue before v150.0.x update as mentioned in the original post, there's a Nightly build from before that: https://ftp.mozilla.org/pub/firefox/nightly/2026/03/2026-03-18-09-29-01-mozilla-central/ that you can download and run separately as a test, perhaps the firefox-150.0a1.en-US.win64-aarch64.installer.exe will be the best format for you.

If it's easy for you to recognize good vs. bad state quickly and knowing that e.g. 151 is bad and 148 was definitely good, you can run mozregression to help pinpoint the exact moment in versions this changed for your timeline — it'll serve the relevant builds for you in an ephemeral way and clean up after itself when it finishes.

It looks like Firefox doesn't work correctly so it makes sense to quit using it and start using Chrome that actually works.