I-Firefox Community Forum

When I watch YouTube videos, Firefox behaves strangely. After a few minutes of watching, I try to scroll to the comments, and then Firefox starts to lag. Scrolling becomes very sluggish, and the entire image freezes while scrolling. The website stops responding, but the sound continues. The only way to fix this is to minimize and then maximize Firefox. Then I can scroll again and the problem starts again. This problem occurs regardless of whether I clear the cache, use an ad blocker, or which screen I'm using Firefox on. Sometimes, one of my screens even freezes and displays stripes. However, this only happens when I'm using Firefox and YouTube. I have no problems with any other applications for exampmple playing games on one screen and let music streaming app playing on the other screen. Even my Cubase 15 work like sweet on booth screens without errors. Why is firefox acting so strange? Firefox never completly stops or closed itself.

Firefox Version 157.0 (64-bit). AMD Software: Adrenalin Edition 26.8.1. Windows 11, version 26H2 installed October 1, 2026 (previous updates also had the same issue with firefox).

I also got some Firefox Updates when i opened it. I was hoping they catched the issue but it seems like the same.

Have a great day :)

As soon as I start browsing short videos in YouTube Firefox freezes and I have to restart it to continue doing anything. It is very annoying. I have Windows 11 (updated) and Firefox is up to date. I don't use a VPN. I have some extensions installed but it happens with or without them enabled. I use Panda Dome as antivirus (It did not happen when I had Windows 10 and Panda) It does not happen with any other video site

Ever since the update to 157 I have been having issues when running firefox. Youtube is non functional on the browser. It is using a large amount of memory (consistently at 41-45% according to the task manager). Gmail takes a long time to load, in fact every page takes a long time to load if at all.

I run it in troubleshooting mode and functionality returns... I don't want to run firefox with all my extensions disabled they are there for a reason.

This update seems to be inherently unstable and is causing issues for lot's of folks.

So just to summarize, the update to 157 has not worked. It is using a disproportional amount of memory, that the previous version did not. It is causing my entire system to downgrade and run significantly slower. Pages will not load properly and I am now using a different browser as a work around.

Essentially it is a huge failure and I wish you would have tested more thoroughly. My experiences are not uncommon... You guys released a garbage upgrade to the browser that has catastrophically under performed.

I do not recollect any update in the past that functioned as poorly as this. Congratulations for completely screwing this up.

When will you guys get this working properly?

Firefox just automatically updated and now when playing video while not being the selected window (eg watching a video in the background while doing something else) it plays at a noticeably lower frame rate.

I was using my computer today and everything was working fine, when I closed and reopened Firefox it automatically updated, I have changed no settings anywhere on my computer or in Firefox but when i alt-tabbed to a different window while watching a movie after the update Firefox started playing at a low frame rate.

Any idea what could be happening? it seems to be caused by this latest update.

(I have seen posts from some time ago that seemed to be having a similar problem but the solutions from them do not seem to work).

My browser is using 2,3 Gb of extra ram it goes away by restarting but comes back in 5-10 min. It occurs wathing twich, i have tried disabling extentsions but it doesn't work. in about:memory the readout is as thoug it is keaping an extra copy of open browser files in ram.

2,511.83 MB (100.0%) -- heap ├──2,301.00 MB (91.61%) -- committed │ ├──2,016.65 MB (80.29%) ── unused-pages/dirty │ ├────230.75 MB (09.19%) ── allocated │ ├─────32.96 MB (01.31%) ++ bin-unused │ └─────20.65 MB (00.82%) ++ (2 tiny) └────210.82 MB (08.39%) -- decommitted

    ├──210.21 MB (08.37%) ── unmapped
    └────0.61 MB (00.02%) ++ unused-pages

The new Firefox 157.0 update has broken pretty much every video streaming website. I've tried YouTube, Twitch, and Amazon Prime Video. In all cases, the same thing generally happens.

Take YouTube for example. The main page itself is slow to load. And when I click on a video to play, it either fails to load or loads but has horrible stutter. When I open up the Firefox Task Manager, every YouTube page shows it's using 100% CPU.

I've enjoyed using Firefox for years, but I'll be moving on to different browser now.

I started noticing that Firefox was giving me a lot of "not responding" freezes the past couple of weeks. The past couple of days I basically cannot access Firefox at all - constant, immediate freezing. I have tried uninstalling/reinstalling (multiple times), disabling hardware acceleration, running troubleshooter mode (still freezes! if it opens at all!), deleting profiles, restarting my computer, etc. I've done just about everything I can find online about this issue. Nothing has worked. I have no issues with Chrome or Edge.

Any suggestions??

My system froze abruptly while I was browsing on Firefox. Cursor was useless. What should I do if/when that happens again? And how can I prevent the freeze from happening?

Windows 11 desktop - latest version with previews.

Within the last week or so, my mouse has started moving very slowly within Firefox. I've tried refreshing and reinstalling Firefox (which is up to date) and deactivating all extensions. However, this makes no difference.

If this can't be fixed, I will seriously consider using another browser as my default in Windows (long time Firefox user).

Mine can be perfectly fine after a fresh restart, then after a few days with a bunch of tabs open it starts getting sluggish.

Closing a bunch of tabs helps, but I’m wondering if there’s something else going on. Curious what other people have experienced.

when i use firefox browser it is lagging too much even if its youtube,chatgpt or a react web app i try to run locally it is lagging very very much when i use other browser there is no issues i really liked firefox and dont prefer to switch, what should i do

This computer works fine with Firefox, but on my other one it opens to Sorry, we're having trouble getting your pages back. I don't want them back. But Ok, I'll go along with you. Try Start New Session: just buffers. View Previous Tabs? Can't remove the checks. Just buffers. I end up either shutting it down myself through Task Manger (no other way works) or waiting for the popup that Firefox isn't working, what do I want to do? I can't close it with the X. Restarting and shutting down then turning on the computer again didn't do any good.

I had this problem a few months ago, but not as severe. Hard booting worked, and as long as I specifically exited Firefox at the end, with the drop down menu, I could use Firefox. Now I can't use it on my other computer, which is where I prefer to work. I have to use something worse.

Bonjour, depuis la dernière mise à jour, quand je me mets en mode plein écran, ma barre des tâches reste présente et seulement sur firefox . J'ai déjà essayé de désactiver accélération materielle et tout le tralala de l'intélligence artificielle à tester mais rien n'y fait . Si je reviens en mode normal sur une vidéo et remettre ensuite plein écran au bout de 2 ou 3 tentatives, la barre s'éfface mais c'est assez ennervant à faire alors que depuis plus de 20 ans cela n'était jamais arrivé . D'autres personnes on rencontrés ce problème de puis la dernière mise à jour de firefox? Je répete que sur opera,brave et edge le problème est inexistant

So normally firefox uses a reasonable amount of ram but sometimes the amount of ram usage almost doubles, then if I try to change tabs the program freezes. I then have to wait for firefox to stop using the excess of ram and return back to normal levels.

I believe this mainly happens when I have youtube or reddit open but I have no idea how to fix this.

I have already tried reinstalling firefox and deleting/changing extensions. The current extension i have on is adguard adblocker and no others.

9/19/2026 Firefox Version 156.0 (64-bit) for windows 11 up to date with Windows Updates. I often have 2,3,4 Firefox windows open, each with several tabs open. Sometimes, Firefox will just totally freeze, and I can't do anything more. ALL Firefox open windows and tabs freeze. Other windows/apps are fine, and working normally. Only Firefox seems to be affected. The only thing I can do is use Windows to totally close/end the Firefox application. It then closes all the Firefox windows. I can then reopen Firefox, and everything seems fine - but I have totally lost the open windows and tabs I was on.

This has happened across several Firefox updates. I do not think this happened prior to 2026. Maybe just since June 2026.

One Extension - Web Threat Shield

Thanks!

I have version 156.0 (64 bit). It seems like the freezing started soon after the update and it is getting worse. Tonight it is only unfreezing for less than a minute. Some of the extensions showed that they needed permissions updated. Since I could not figure out what they did, I disabled them. None mentioned cursor control or issues that looked like they were nothing but options.

Hello, Might the "do not sell" signal (that firefox offer to send automatically to website) slow the browsing please ? I can't figure out if it is a whole request to send in addition or just few bit more in the initial one, or something else I don't have in mind. I'm currently struggling with lots of tabs slowing my computer, even paralyzing the mouse . I try to optimize as I need to keep my tabs, but I don't what is the best way to manage that. Are the tabs less expansive than using windows, for the memory ? Could the groups of tabs lighten the storage ? Is it better (and more usable! ) to bookmark or add to "the task bar" when we just need to keep the adress to use it later ? Actually, is there a doc already answering to that please ?

I hope you might understand my bad english and that sometimes, we can't find other way than keeping too many tabs.

Thank you, Erin

Hi Mozilla team,

I’d like to report a serious issue with Firefox lately. The browser has been performing very poorly and frequently becomes “Not Responding.” In many cases, websites fail to load properly or get stuck indefinitely, even though my internet connection is working normally.

I’m experiencing these issues on the latest version of Windows 11 with the latest version of Firefox. This has become quite frustrating and significantly affects my daily browsing experience.

I hope the Firefox team can investigate these stability and website-loading issues and provide a fix soon. Firefox used to be much more reliable, but recently the overall experience has been very disappointing.

Thank you.