Firefox Support Forum

Hey folks, hopefully you can help with this mysterious issue!

I've been running Firefox successfully on my Windows 10 PC for a long while now. Last night, for some reason it simply ceased to work. New windows and tabs would not load any content. I also couldn't access the Settings at all (clicking on Settings in the browser menu produces no results or feedback.)

Yesterday, I had Firefox open all day (I usually have my computer on all day), and it was working fine. Around 8 or 9pm, I first noticed that none of my open tabs were loading any content, and the tabs had the "loading" animation playing. New tabs would also not load any content. I assumed it was an internet issue as I did see my internet connection get disrupted once or twice. I did not see anything (apps, etc) on my PC updating.

This morning I found Firefox was still not loading anything, although my internet connection was fine. I tried opening Chrome, and it ran just fine. Everything else that it is internet or cloud based on my PC is running fine too. So it seems to be an issue just with Firefox.

I have listed my steps to troubleshoot below, but I want to note one weird thing I observed: Even when Firefox is closed, and Task Manager doesn't show any Firefox processes open, my PC seems to think Firefox is running. For ex. while trying to uninstall Firefox or delete certain files, I would get a warning to "close Firefox first" or "can't perform this action while app is running." After seeing these, I would again confirm that Firefox appears closed and Task Manager shows no related tasks.

My PC build: - Windows 10 Home, 64 bit - Version 20H2 at start of issue (updated to 21H2 during troubleshooting) - OS build: 19044.1526

Things I have tried for troubleshooting already: - I have WebRoot on my computer due to my job, and I asked our IT staff if they could see WebRoot blocking anything related to Firefox on their end. They said it was not. - Used "Firefox Refresh" - Uninstalled and reinstalled Firefox - Cleared app cache / app data - Updated Windows from 20H2 to 21H2

Note: This message was sent on a different computer & browser

After MickeySoft's Patch Tuesday today, I found that KB5010342 prevents Firefox from running. I'm running Win10 Pro with FF 97.0 64-bit and with this patch installed, FF opens with a blank screen and no DNS lookup or anything. Other browsers like Chrome or Edge load and work without issue. After manually uninstalling this patch, Firefox again works like it should.

Any ideas on how to fix this? Thanks.

So yesterday I got a new computer and downloaded Firefox to be my default browser. It worked fine the first few hours -- I was able to log into my account, set up my extensions, and use the browser as intended. A few hours in, though, it completely crashed on me. I am unable to go to new websites, refresh a page, open bookmarks, log in to my Firefox account, or even open settings; the home screen also doesn't load when I open a new tab. Literally the only thing I can do is freeze the Bookmarks Toolbar and customize the Toolbar. I tried closing and reopening, refreshing/resetting the browser, restarting my computer, going into Troubleshoot mode, deleting and redownloading the application, but nothing is working. I have no trouble with Firefox on my previous computer or my phone, and Edge is working fine on this computer. I don't know what to do anymore. Any help would be much appreciated.

The Firefox browser won't load unless I restart my laptop. It works for a few minutes then I am unable to navigate web pages. I am not getting any error messages. If I use Microsoft edge I don't have issues.

Hello All, I'm having a issues with firefox on windows 10. I have been using it for years and this is the first time i have had this issues. Firefox will not load, if it dose it just a blank screen, I can not go out to any web page. I have tryed the work around, uninstall and reinstall noting is working. Has any see this before. My last step is looking like reinstalling windows be seeing how firefox is working on other PC i have in the house i do not wish to do this. Can any one please help me.

Thanks

My Firefox v97 is stuck it will not connect to websites. I've resetting the http3, not working. This problem is also affecting the installed microsoft edge browser. Is this malware or a faulty setting some where?

Firefox will only open in the background of my computer no matter how many times I try to open it. I have reinstalled Firefox and deleted and reinstalled its files many times. When I try to open Firefox, my mouse shows that it loads and then it only opens in the background. I have tried safe mode and editing my profiles too.

So I got on my computer today, and I tried to open Firefox, but it wouldn't open, I would get a loading icon on my cursor and then nothing. So I restarted my computer, same issue. Reinstalled Firefox, same issue. I then reinstalled after having deleted the %appdata% folder for Mozilla, but that also changed nothing. So I looked in Task Manager, and it would just open instances of Firefox as a background app no matter how many times I clicked. I've also tried using other browsers with no success. (Also, I'm runnning Windows 10, 64-Bit version, and had not installed any programs recently before Firefox stopped working.) I would greatly appreciate if I could get some assistance with this because I prefer Firefox much more than Microsoft Edge which is the only browser I'm able to use right now.

Firefox has been awesome. But, my computer just updated to windows 11 and now it doesn't work. Sometimes I try to open the browser and nothing happens (but I somehow end up with something like 7 instances of it running in the background, according to task manager), sometimes I get it to open, but it won't load my homepage or anything, and sometimes it seems to work fine but only for a little while - then it just stops responding.

I have no idea why this is happening or how to fix it. I tried the browser reset, which helped for a little bit but then the problems came back. I think having a theme installed makes it worse, but now I can't even get settings to open so I can try turning it off to see if that helps.

Any ideas? Not being able to use the internet on my computer is a pretty big deal. I'd prefer to not switch browsers, but I don't know what other option I've got at the moment.

Thanks!

I have long used Firefox as my main browser. Yesterday afternoon (2/10/22) Firefox seemed to totally forget me 1)would not respond to Google 2)lost stored info for me like my facebook page, email entry, volleytalk, etc. 3)general question is that Firefox seems to frequently have changes to its program...if user does not want it, Firefox is relentless in asking for approval of change, asking over and over and over

Just today I started running into an issue with Firefox that prevents me from launching it a second time. Once I close it it closes for good. I can't load a web page or even go into settings. I've tried Uninstalling and reinstalling multiple times and nothing has worked... I'm at a loss. I need help asap

Firefox installed in Windows 10 (64). Just recently FF will not open when executed even though Windows Task Manager shows it is a running process. I've rebooted and reinstalled to no avail. It's the latest version. Any suggestions?

The Firefox on my PC abruptly stopped working for pretty much no discernable reason and I don't know what to do. I've tried restarting the PC, uninstalling and reinstalling Firefox and nothing.

I dont get an error message. It just...doesn't start. If I reinstall it, I'm able to get the browser pulled up but then nothing on it works. It won't take me to any websites, it won't open the settings, it won't do anything. Refreshing the browser doesn't work either.

Failing that, I hopped on my phone and attempted to troubleshoot using information on this very site. I discovered that the problem might be stemming from corrupted profile data. I attempted to load the profile manager from Windows using command prompts...but that command doesn't do anything either.

I attempted to find the profile data on my computer and delete it...didn't work. I tried to reinstall Firefox to have it generate new browser data and that didn't work either. I dont know what to do and I dont know I'm supposed to fix this.

Please help, thank you in advance.

My laptop took an update on 2/8/22 and my Firefox stopped working. The toolbars showed up, but nothing in the main window and most sites wouldn't open. I uninstalled and reinstalled. It would work correctly for a couple of sites, but would just stop working. Only the toolbars (bookmarks and search) were on the screen. I removed the app data for Mozilla and uninstalled and re-installed again. It again worked normally, but only for a few minutes. Just toolbars and a white main window. My laptop was running Windows 10 when this happened. I went ahead and installed Windows 11 and did another re-install. Same thing. It worked for a short time and then quit. It doesn't seem to matter if I sign in and sync or not. I hope there's a fix for this. I love my Firefox! I'm using a different computer to send this. It is a Windows 10 machine that has the same update, and Firefox is working fine on this machine.

Firefox will not open on my laptop. The tab opens but the homepage does not appear even after waiting 5 minutes. I've run all my updates to my Dell Laptop. I am fortunate to have it on my phone. I am a perpetual monthly subscrber.

As of yesterday, Firefox won't load any webpages or firefox pages (e.g. settings, config, etc.). I've tried refreshing the install, uninstall/reinstall, and updating my Microsoft visual c++ redistributables and this problem persists. By "not loading webpages," I mean that it doesn't even show that it's directing to any webpages when I attempt to route to them. Any advice?

I've had this browser installed on my computer for about a year. It is worth noting that, all of the browsers worked perfectly fine before. However, after roughly 3 weeks of regularly seeing that all of the browsers on my Windows 10 PC (Opera, Firefox, Tor) except Chrome browser don't seem to start up. When I run Firefox.exe, it opens for a fraction of a second, displays a text box, and then closes. I tried recording my screen to understand what's written more clearly, and it said "Profile Missing". But not the familiar profile missing error. this one closes immediately, and with no text, only the title. It is also important to mention that all of the files associated with the browser also won't open, except helper.exe. For example, this command "C:\Program Files (x86)\Mozilla Firefox\firefox.exe" -P to open the profile manager will show the same error.

Things I tried:

1. Refreshing the browser. 2. Uninstalling and reinstalling. 3. Removing the appdata profiles folder. 4. Installing other versions of Firefox. 5. Scanning for malware with 3 different Antivirus programs.

And so far non of these methods worked. I would like to get an answer on how to fix this. Thanks.

I've done everything I can think of. I've ended the task, restarted my pc, uninstalled, reinstalled. Nothing has helped. It's a miracle I can still launch the file, it maybe starts once every 7 tries. I have no idea what happened or what I'm doing wrong, but its been like 2 hours and I'm still beyond lost.