Firefox Community Forum

Hey, I am currently working on an application where I want to upload files to a server using mtls via a webapp. The upload goes to another url and server than the one where the webapp is served from. If I test the file uploading without mTLS, it succeeds, and with mTLS enabled it also works in chromium, but in Firefox I get the following error: "Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at <url> (Reason: CORS request did not succeed). Status code: (null)." on the `OPTIONS` request before the `PUT` is done. The client and the server both have a certificate from a custom CA, which I imported into firefox, along with the private key. Does someone know what the issue here might be? I am suspecting that there is some problem with firefox loading the user certificate on the preflight request?

Hello, on my local disk I have Firefox for Windows (10) installed for more than 2 years now, and the location: %Appdata%\Roaming\Mozilla\Firefox\Profiles\xxxxxxxx.deault-release\storage\to-be-removed has more than 7000 subfolders and files that sums up to 4GB of data, dating from mid 2023.

I naturally assume that a "to-be-removed" named folder should have it's content removed by some automated task or maintenance service, right? Is this normal, or is there some bug in application maintenance / updating process?

Thank you

How can I load group of tabs I have a previously saved? I checked the article about tab groups: https://mzl.la/4iQYJr3

I'm using the vertical tab bar. I cannot find the List All Tabs toolbar icon shown in parentheses. Thanks for the help.

I've blocked access to nearby devices without knowing that this would affect my local network websites. Now the option to change this on the settings simply does not appear for me. What can I do?

Bonjour, je ne peux plus me connecter à ma boite mail hotmail.com depuis la version 144.0.2 (64bits) de Firefox Je suis avec Windows 11 famille 64 bits - 24H2 et 25H2 (j'ai essayé avec les 2 versions) avec un compte local. Je choisis de me connecter avec un mot de passe et après avoir validé le mot de passe, j'arrive sur une page qui me dit d'utiliser un autre appareil ou une autre méthode de connexion. Je joins les fenêtres de connexion étape par étape Avec Google Chrome (que je ne veux pas utiliser), je me connecte sans problème à ma boite mail avec les même étapes décrites ci-dessus. Pouvez-vous m'apporter une solution ? Merci, Marc T.

Just now will not save a page to bookmark folder, even in trouble shoot mode. Know how to save. See pages in recently closed pages, but do not know what is the cause. Should I refresh, tried close and reboot system. Let me know some steps to analyze the cause and remove it. Thanks, but don't under stand the method to ge Troubleshooting Information.

Crash report IDs: bp-31e9bb18-9b55-45a8-85fb-5e8340251103 | bp-c7eef78f-d94c-4949-923e-533ed0251031 | bp-6eb06859-ca6b-4046-97bc-000b90251022

A bit over a month ago, I was away from home for several weeks. When I came back, a browser that worked perfectly before became near unusable with constant and random crashes. Sometimes they occur even with no user input. I have tried troubleshooting mode, I have removed all extensions, I have tried all the fixes I found on Google, I have reinstalled the browser, I have updated all the drivers, I have done MemTest86 which was passed with flying colours and I have even installed a firefox fork (waterfox) to try and fix this all to no avail. I have no clue where to go from here, as it feels very bizarre. All help is much appreciated.

I get n error report when I try and access the seagate login page. This was not a problem a couple of days ago. The error report says 'You have not selected this website for SSO'.

I cannot find any help to resolve this problem and it is slightly odd that it was an accepted site previously.

Many thanks for your help Paul

When I close a tab that had a video playing, the picture-in-picture box will stay there after I close the tab. The picture is just a white box. The controls are there, but when I click on any button, nothing happens. I can only move the box around and resize it. It usually happens when I close the tab while the video is playing, but sometimes it happens when I close the tab and the video is paused. It happens on videos that were in a picture-in-picture box and videos that weren't. I go into setting and disable picture-in-picture which will stop new picture-in-picture boxes, but won't get rid of the white box. The only way to get rid of the white box is to close FireFox completely and then reopen it.

Spell checking does not work with Outlook Web Mail in Firefox. This issue has been raised by many others but I find that the answers and solutions don't match my user interface and aren't really solutions. This seems to be a widespread problem and I really feel that Mozilla should solve it. Otherwise users like me will likely need to change browsers. - I am using the latest version of Windows 11 and Outlook Web Mail. - My Firefox is up to date (144.0.2) - Spell checking works if I switch to plain text. Thanks for any help with this matter. Mario

Hello,

I recently installed a new add-on in Firefox — the one that allows you to create different profiles with individual names and colors in the browser.

After the installation and a subsequent restart of my MacBook Pro, my previously open session windows were not automatically restored when starting Firefox as usual. Instead, a message appeared asking whether I wanted to “restore all session windows.” I clicked “Yes,” but none of my previous windows opened.

Since then, my saved passwords and bookmarks also seem to have disappeared. I suspect that my previous profile may have been overwritten or that a new profile was created.

Could you please let me know if and how I can restore my previous sessions, bookmarks, and passwords? Is there perhaps a way to access my data through a backup or via the sessionstore.jsonlz4 file or an older Firefox profile?

Thank you very much in advance for your assistance.

Kind regards, Diamant Adler

Hello I am having major problems with Firefox at the moment and have done for a while. I curently have four pages open but as you can see from the attached screen shot of my Task Manager, there are 14 Firefox processes. The usage is OTT on memory and everything else. Could you tell me why this is happening? Currently it is running in Troubleshooting mode but that is not doing anything to improve the problem. It has been known to shut my computer down, as it gets too hot. I run on Windows 10 and Bitdefender is my security. All help is gratefully received. Thanks Lisa

Hello, I reinstalled Firefox and am unable to recover my bookmarks and other data. Before the re-installation, I manually backed up my data, but when I try to restore from the backup, it does not work. All my bookmarks and previous data are still missing. How can I fix this and recover my information?

My desktop (WIN 11, fully updated) Firefox (reloaded yesterday) does not play well with Google's Blogger. I maintain an open tab on my Blogger account, but that SEEMS to cause freeze-up on all other tabs. THis morning I opened a tab and attempted to sign in to Blogger but a connection to Google never came through. However, when using Edge to open/use Blogger there are no problems.

Dear, When playing a video on Youtube, Jellyfin or listening to the radio the video stops after a second of playing. Restarting FireFox works for a short amount of time and after that constant pausing of video's after pressing play. Really annoying.

What I allready tried - What is pressed --> none - Rebooting PC --> 5-10 min fix - Restarting FireFox --> 5-10 min fix - Updating FireFox --> Was on the newest version of 28 OKT 2025 - Updating Windows 11 --> Was on the newest version - Problem Solving Mode (So plugins/addons disabled) --> No fix - Chrome --> Works perfectly - Brave --> Works perfectly

Any idea's/fixes

I'm running Firefox 144.0.2 (64-bit) on a Mac using Sequoia 15.4.1 OS.

At the most recent Firefox update, I added VPN.

Since then, I've had a problem with Firefox hanging. Not immediately but after varying amounts of time, 20-60 minutes. I get an "Out of Application Memory" pop-up but the usage for both Firefox and other elements are well within normal range, not high. It's completely frozen and the only way out is to do a Force Quit.

There are times when doing a shut down I notice that VPN has somehow been turned Off and once I saw a message of Background Service Error attached to it.

Having to constantly re-start Firefox is a major pain. Oh-- I did turn off the background AI thing under Tabs. I hate AI and try to turn it off everywhere I find it. A resource suck and bad for the planet.

Any help appreciated.