Firefox Community Forum

Right below the search bar my browser has a warning "The security sandbox is disabled. Your configuration is unsupported and less secure."

I am on Windows 10. I have tried uninstalling firefox, removing appdata and all other firefox files and settings, resetting about:configs settings, disabling my BitDefender antivirus. Nothing fixes it. Completely fresh install of firefox still gives me that message. Sandbox level is default (9).

Any help would be appreciated.

Today following a brief power outage I was no longer able to sign in to AOL with Firefox on my desktop computer. I am able to sign in to all other apps with no problem. I tried clearing my cache, restarted Firefox, restarted my computer and spent 30 minutes on remote desktop access assistance with AOL trying to fix the problem with no success. I can log in to my account using Chrome on the desktop computer and can log in with no problem using my Android phone but can't log in using my desktop computer with Firefox. I've verified that my Firefox version is updated. I am running Windows 11 Pro.

I would greatly appreciate any helpful advice.

FF147.0.1 64bit Linux

I have about:config > toolkit.legacy ... stylesheets set to true, but how can I determine if FF actually 'loaded' the file <profile>/chrome/userChrome.css ?

Alternatively, is there a css tweak that is known to still be working in FF147?

today I tried using a link from discord to go to a site. a window I was unfamiliar with stating it was firefox told me to pick a profile. I had 2 at that point but I saw none at that point. I ignored it and did nothing. I restarted my computer later on after a file browser issue and when I tried to find my profiles and my last session I found nothing. my entire fire fox account has been wiped and I only have a single profile in my app data thats onlder than 2026. I have no idea whats happened.

Mid day Sunday my whole account disappeared and I had to create a new one. If this was an update I dont like it I dont have the time for this. Why did this happen. I have been a supporter for years and now not sure

Здравствуйте, проблема с восстановлением моих закладок. Дело в том что я продал свой пк и купил новый. И когда установил браузер. Вошел!! В свой аккаунт где были сохранены вск мои пароли и заметки просто исчезли. Я не знаю что делать. Доступа к старому пк у меня нет. Я не понимаю почему браузер не хочет восстанавливать мои закладки и все сохраненные сайты.

I use the Microsoft Defender Security portal (security.microsoft.com) in the Firefox browser. In this portal, if you click on the "?" in the top right of the page, a flyout window opens and you should see support options on how to get help from Microsoft. On Firefox, I get an error that says "You do not have access to this experience. Please contact your admin to request help and submit a ticket". Microsoft has told me this issue is not a Microsoft issue since this only happens on Firefox and not any other browser. I am seeking help from any Firefox experts to figure out why I am getting this error in Firefox and how I can resolve this issue. I am running version 147.0.1 (64 bit) of Firefox.

When Windows 11 reboots, and Firefox is restarted, it opens a very tiny window in the upper right part of the computer screen. Why is this? I believe I reported this before but it still is not resolved.

Firefox lost all my passwords and bookmarks, not in any of only 3 profiles. Now it won't enter new passwords and Mozilla/Firefox support not working. I don't know if this is even being entered

When I select a text and right-click, the option to translate by Firefox's native translation feature appears. The default target language for this seems to be the defined by locale; for my case, it's always Turkish. How do I choose a different target language to appear in the context menu? I cannot see an option for default target language in settings.

When there are many tabs open, the displayed tab line re-centers automatically obscuring the open tab. Is there a way to disable this mechanism, or to insist that the open tab is kept visible? The current mechanism that obscures the open tab is user unfriendly.

I run the current version of firefox on a Windows 11 Dell Inspiron Laptop. My bookmarks are here, but the tags have disappeared. This has happened once before, and it took several days to restore the tags. Why is this happening? How do I prevent it?

I have been using 1Password 7 to manage my login credentials. It includes a Firefox extension to fill in account names and passwords in login alerts and pages.

Firefox 147.0.1 (macOS aarch64) in January 2026 has broken 1Password 7's ability to fill in account names and passwords.

To reproduce: 1. Install 1Password 7 Version 7.9.11 (70911000) and its extension version 4.7.5.90 in Firefox 147.0.1 on macOS. 2. Visit a URL for which 1Password 7 has login credentials. 3. Click on the toolbar icon for 1Password 7. A 1Password 7 dialogue box pops down from the icon, containing the username and password for that URL. 4. Click the Autofill button in that dialogue box.

Observed behaviour: 1. Username and Password fields remain blank.

Expected behaviour: 1. Username and Password from 1Password 7 appear in the Username and Password fields.

For approximately the last three months, there was a partial failure similar to this. 1. 1Password 7 popdown dialogue moves from the toolbar icon to the Firefox tab for that URL. 2. Username and Password fields remain blank. 3. Workaround: click in the username field, then tab 2-4 times to further UI objects in the login credentials form. Then click the 1Password toolbar icon, then click the Autofill button in the popdown dialogue. Then, the Username and Password from 1Password 7 appear in the Username and Password fields.

The expected behaviour occurs for the same URLs in Safari.

Thus I suspect that Firefox has somehow changed its behaviour in the last few months to cause this regression. I have not changed the 1Password software versions in this time, because I am intentionally using a previous version of 1Password.

I am looking for a fix or workaround which works with my current 1Password software version. I am not interested in a solution which requires me to upgrade to the current version of 1Password. (The current version of 1Password imposes a feature which I am resisting.) I realise that this reduces the chance that I can persuade the Firefox team to find and correct this regression.

Anyway, Im Trying To Print An Email Message To a PDF File But Instead I Get An Error Message That Says :

Could Not Open The File Access Is Denied!

Is There A Way To Fix This? If So How Do i Fix This?

This problem just started with the latest version of Firefox that opens with two profiles. It worked for a short time and then failed. Firefox will not open if I choose the default profile. I can open Firefox if I choose Profile #2, but it has none of the history of the default profile. I lose all of my extensions, history, bookmarks - everything.

How can I get back to where I was yesterday? (Note: I'm just a user, not a computer geek, and don't understand the buzzwords or technospeak. I can follow clear instructions like copy, delete, rename, etc.)

I'm using an HP laptop with Windows 11.

I am using version 147.0.1 (don't know when last update) For the last 1.5 hrs I have been trying to restore the extensions icons as well as other, to the tool bar. when I close "customize" after putting them there they disappear, as does the "puzzle" piece I put up there. What is going on? I have read numerous articles on how to fix this to no avail. Only one character will stay to the right of the added search bar.