Diễn đàn hỗ trợ Firefox

I run normal firefox on linux. Fully up-to-date. Every time I quit the app, it reverts to a version of my profile from a month ago, and loads all the tabs I had open then, and then receives all the tabs that I sent to the device in the interim (~1 month). As I speak, it just caught the 60 or 70 tabs in this window.

I tried changing the name of my profile folder to randomstring.defaultOLD and changed one of the backups to randomstring.default. This didn't change the behavior. I'm still stuck in the loop. I saved my tabs with onetab, because firefox isn't remembering my session anymore. I thought it was something to do with updates, like it only loses its mind upon updates, but that's not true. It thinks it's updating firefox EVERY TIME, because the one time it's loading to 1 month ago it was updating, but I'm 100% sure there are no updates to firefox in my linux. It's just hallucinating.

The articles on restoring from backup are outdated. They say to use an html file. There is no html file. It's just folders for profiles, not html files. HELP!

Hi Team, I am facing an issue that i have setup the download setting of PDF file as save file and automatically download in my system. but firfox is not working as expected.

When I login to a site where there are many widgets (windows) on the screen - the windows are all missing scroll bars. If I login under a different browser they are there. This happened about a week or so ago. It has to be a setting change in Firefox. Please advise.

My Firefox VPN is still showing as nearing my limit, despite it now being October everywhere in the world. Why hasn't it reset to 50GB? I've tried restarting Firefox and it didn't make any difference. It still shows "Getting close to your VPN limit. You have 2.2GB of 50GB left this month."

Hello,

I have had an issue for a few months now where certain websites fail to load. This is most easily reproduced on https://addons.mozilla.org, where I am shown the error "An unexpected error occurred" on most pages, preventing me from installing addons.

This issue does not occur in a Private Window, in Troubleshooting mode or in Chrome or Brave, but persists in fresh installs of Firefox. In troubleshooting this issue, I have removed all program files, registry data, and app data pertaining to Mozilla / Firefox. In fresh installs, I can sometimes install an add-on or two before this error starts occuring. I have not imported any previous data.

I was previously installing from Chocolatey, but in my last clean install, I downloaded from the official website.

I am on Windows 10 and Firefox 157. I use Proton VPN (Paid) and have tried changing servers several times to no avail. Again, this only happens in Firefox in a standard window, Private Mode and Troubleshooting Mode are fine.

Screenshot 1 shows the issue from my most recent reinstall. I was able to install 1 add-on (SponsorBlock) before it started showing up. Removing the add-on doesn't fix the issue. Trying to access addons.mozilla.org via a search engine results in the tab icon loading for a second and no change happening on screen (Screenshot 2).

I experience similar issues on other websites, like trying to log into Bandcamp.com (logging in gives the error "There was a network error. Please try again."), but most sites work.

Loading https://addons.mozilla.org/en-US/firefox/ gives the following results in the Network Console:

Uncaught (in promise) TypeError: can't access property "pressed", target is null

   onChangePermissions chrome://mozapps/content/extensions/components/addon-card.mjs:893

addon-card.mjs:893:7 Reporting Header: invalid JSON value received. collect Reporting Header: invalid JSON value received. collect Reporting Header: invalid JSON value received. collect Reporting Header: invalid JSON value received. collect Reporting Header: invalid JSON value received. collect Reporting Header: invalid JSON value received. collect

I have done thorough testing with other browsers, drivers for my headset, reinstallations and the common issue is the new firefox. when I change from my desktop speakers to my headset there has always been a slight delay in the crossover. however since the most recent update Firefox has made, Youtube shorts and videos dont load properly. this is only when using my headset. when you go to shorts, and scroll it will play them one after the next with no load time or at least very little. now however, it takes 10-15 seconds to load, but ONLY when i am using my wireless headset. Corsair Void Wireless Headset. I have done everything on my end, and after countless tests with other browsers it is only Firefox and has only starteed since the most recently update.

HI All Recently purchased a laptop and want to have FF sync with my desk top. I am signed in to both devices with the same account and have checked all settings on both and they are identical. Why are they not syncing?

I have been having random crashes Firefox Snap on Kubuntu 24.04 (and now 26.04). Sometimes Firefox will run stably for over an hour, sometimes it will crash in less then a minute from (re-)launch. I have tried the usual troubleshooting steps of 'run in troubleshoot mode', 'refresh', disable plugins, but the crashing seems to happen even when running in troubleshoot mode. I also have not been able to figure out any kind of event or user-action that triggers the crash; it might happen while browsing, it might happen while I am not even at my computer. At first I thought 'the Devs will handle this', but it has been some 6 months so I think my case is not very common/pressing to the community. I'd like to take a more proactive approach in solving the problem. I am still a novice at software fixing, so I might have skipped or missed a very basic step in the '10 things to try to fix Firefox'.

Title. 156.0 had NVIDIA Video Super Resolution working just fine. 156.0.1 has broken it on my setup. Nothing I have done has brought it back - toggling settings, clearing caches, forcing it on in about:config, etc. The plugin seems to be broken.

Was working just fine for over a year prior.

Latest Stable Firefox 156.0.1 RTX 5080 Driver 596.49 (May '26)

Does not show as working in the Control Panel, and is clearly not working on any video site. YouTube, the BBC, and Twitch were the ones most tested.

Please consider a fix. Thank you.

I am trying to use the VPN feature to connect to BBC iPlayer in UK. I switched on the VPN in the browser and selected United Kingdom. It doesn't seem to work as BBC iPlayer tells methat I am connecting from outside UK.

All of a sudden all of the videos I watch on YouTube with Firefox are defaulting to mute on my Macbook. I haven't made any changes to settings, etc. I don't have a YouTube account so I can't make any changes there anyway. I am having to unmute each video before I watch it.

We’ve got the Nova browser redesign—everything looks great—but why does the download manager design still look like it’s from 2005? It’s a very important part of the browser, yet in its current state, it looks embarrassing.

Actually, I believe the aspect of a browser that should not be changed casually is the UI that users interact with while browsing, such as tabs and sidebars. Any changes to configurable UI elements are acceptable, but Firefox should now refrain from altering the UI and instead focus entirely on fixing bugs and optimizing performance. The UI represents the face of a browser, and constantly changing it not only fails to attract new users but also neglects the needs of existing ones.

Firefox was recently updated automatically. Since then, I cannot access my Yahoo mail. I can access my emails using Bluemail. When I try to access my emails with Yahoo on Firefox, I receive the following error message.

An error occurred while processing your request.

Reference #97.eba5dc17.1791129448.55aeae20

https://errors.edgesuite.net/97.eba5dc17.1791129448.55aeae20

Get error message An error occurred while processing your request.

Reference #97.ab560e17.1791126296.d756946b

https://errors.edgesuite.net/97.ab560e17.1791126296.d756946b

and cannot access att.net email. This started on Friday after I got an update from Firefox. can you help?

Hi Mozilla Support Team, I am facing an issue while using WordPress on Mozilla Firefox. The custom fields and options inside the WordPress editor (Gutenberg / Classic Editor) are not loading or responding properly. Issue Details: Custom fields and meta boxes fail to render or freeze when interacted with. Data entered into these fields sometimes does not save upon updating the post. The same WordPress dashboard and fields work completely fine on other browsers like Google Chrome. System Info: OS: Windows Browser: Mozilla Firefox (Latest Version) Platform: WordPress Dashboard Troubleshooting Done: Cleared browser cache and cookies. Tested in Firefox Troubleshoot / Safe Mode. Please guide me on how to fix this browser rendering / JavaScript compatibility issue in Firefox. Thanks!

Why isn't this happening when I open PDF files? Usually, there's an option that lets me choose between opening it directly in Firefox or using my PC's default app (Foxit Reader), but it keeps opening directly in Firefox instead.