Firefox Community Forum

I'm having an issue where when you try to do things in-browser, Firefox freezes, puts up a grey screen and holds this way for a few seconds. Scrolling and video seem to trigger it most often. Repeatability is nominal; sometimes I have no problem, sometimes every action I try to take results in another fit of grey screens and freezing.

I'm using version 153.0.3 64bit on Windows 10.

So I know these websites are kind of crap anyway, but I have issues with scrolling bsky.social (and other clients for it like witchsky) and twitter. The further into the timeline I get, the more frequently these webpages lag.

They begin freezing every few seconds for a few seconds, during which they queue left or right clicks, page up/page down, and various other commands, only processing them once it unfreezes. Firefox itself still works during this freeze, e.g. opening the main menu. Also, I can still scroll up or down to a limited degree, though this just exposes empty, unrendered webpage until it unfreezes.

bsky.social has had this problem for a long time, but twitter only recently developed this issue after I had to do a cache clear, cookie clear, etc. trying to log in a few weeks ago. Prior to that it didn't have this issue.

Task manager hasn't really helped elucidate what's wrong, so it might be an about:config that I set or even an unruly extension, but I really don't know what to try.

I'll be on a page, maybe Facebook, the NYTimes, Amazon, or really any site, and suddenly I find I can no longer scroll, or otherwise navigate the page. I usually have to refresh the page, not so great an option, if I was in the middle of doing something, and and then it'll work OK. I shouldn't have to be doing that, and wonder why pages will just freeze up like this.

Whenever I have to restart my cpu, the menu bar appears to try to open all of the tabs and it causes system hangups and says that Mozilla Firefox is not responding. What causes this ??

For the past few days, the text in the address bar can no longer be selected or edited using the mouse or keyboard. The “Customize Toolbar” option does not allow you to remove the address bar from the toolbar.

Unfortunately, compatibility mode doesn't help here either. The problem isn't caused by a plugin.

Is there any way to fix this without losing all my Firefox settings and add-ons? I'm hesitant to try repairing Firefox.

Windows 11 Pro 25H2 64-Bit/Firefox 154.0b5 (64-Bit)

The complete page I'm looking at, blurs when my desk top page changes. When I mouse over the page the blur clears up just under my mouse. Now you might want to focus on desktop but changing taps also cause a blur. When I say blur i am talking the hole page. I'm using Arial and have ran clear text on both monitors it all so seem worst when I used the new side tab load. Never had an issue on older fox loads. Submitting from my laptop not from affected computer.

Firefox hangs when Thunderbird is open. At this moment, Thunderbird is not open and Firefox is hanging on opening any web page. I had to use Chrome to get to this site and request help. Here is info about my PC:

Device Name Ginny-PC Processor Intel(R) Core(TM) i5-4430 CPU @ 3.00GHz 3.00 GHz Installed RAM 8.00 GB (7.88 GB usable) Storage 233 GB HDD Hitachi HDP725025GLA380, 466 GB HDD ST500DM002-1BD142 Graphics Card Intel(R) HD Graphics 4600 (113 MB) Device ID 13E09BB5-804A-4882-A64D-CA16EABC9EF4 Product ID 00330-80000-00000-AA914 System Type 64-bit operating system, x64-based processor Pen and touch No pen or touch input is available for this display

Edition Windows 10 Pro Version 22H2 Installed on 9/8/2020 OS Build 19045.6466

I have noticed for some time when I access Facebook the site reacts very slowly and hangs up frequently. When I access Facebook on the Chrome browser I don't experience the same problems. So, it appears my Facebook issue is a Firefox browser issue. Can anyone please help and explain how I can improve my Facebook experience while using Firefox. Appreciate any help. Thank you.

After updating to Firefox 153.0.1 on my 2026 MacBook Pro Silicon running Tahoe 26.5.2, my Firefox sidebar refuses to open, either by toggling the menu bookmark sidebar icon or pressing the shortcut keys.

Hello! Since the latest update to Firefox (153, I believe) my Firefox has not worked. It starts up perfectly fine, but quickly freezes, becomes non-responsive, and needs to be closed. No matter how many times I attempt to open it, the same thing occurs. There’s been been occasions where it hasn’t frozen immediately so I have been able to turn off hardware acceleration as well as remove my theme and disable all my add-ons/extensions, but this has done nothing. Creating a new profile does not help, nor does trying Safe Mode: the same thing happens no matter what. I tried to reinstall the update, but this also did nothing. I haven’t yet tried to uninstall & reinstall or do a Firefox refresh as those are my last resorts and I won’t do them unless I’m sure they’ll make a difference. I haven’t downloaded any new extensions recently, and this only started happening after the most recent update. I’m not sure what else I can try at this point, and am very frustrated.

On a new laptop with Win11 Home (x86-64) with Firefox just installed, the cache size is 54 MB. When Privacy and Security -> Clear Browsing Data is clicked, Firefox hangs - no input is accepted and nothing appears to be happening. On closing Firefox and then reopening the cache size is reduced and Clear Browsing Data operates as expected.

Why is the cache size (54 MB) so large? Why does Clear Browsing Data hang Firefox?

Hello, After the last update i keep seeing a blank page when i open a new tab or new page. i tried the troubleshooting mode but the same. i need to refresh every time i open a new page.

An 8 second delay when I open Firefox for the first time.. Once it has been opened once, it reopens immediately when required. The problem has been present since I installed Linux Mint 9 months ago, Linux Mint 22.2 then, since upgraded to 22.3 Zena. I can live with it, but it is very frustrating! I have tried the obvious things like removing extensions, but I suspect it is a "Linux" connectivity problem rather than a "Mozilla" problem.

Dear Mozilla Firefox Support Team,

I have been a loyal Firefox user for many years because I have always appreciated its speed, privacy, and reliability. However, I have noticed that Firefox has become slower over time, and I am disappointed with its current performance.

The browser feels increasingly sluggish during everyday use. One of the biggest issues I experience is with YouTube, where videos often do not play as smoothly as they should. I also notice that Firefox consumes a significant amount of RAM, even when only a few tabs are open, which affects the overall performance of my computer.

I sincerely hope the Firefox team will prioritize performance optimization in upcoming updates. Many users, including me, want a browser that is fast, lightweight, responsive, and efficient with system resources. Speed and smooth performance are some of the main reasons people choose a browser, and I would love to see Firefox become the quickest browser again.

Please continue improving memory management, reduce unnecessary resource usage, and optimize YouTube and other modern websites for a smoother browsing experience.

Thank you for your hard work and for listening to user feedback. I hope future releases will focus on making Firefox faster, lighter, and more responsive.