Firefox for Enterprise Community Forum

My in house security team, recently suggested that Firefox be marked for automatic updates. I did so reluctantly and within three weeks, my feelings were confirmed. I logged in and hit the firefox button. Not found. OK, where did they move it? Program Files. OK. I opened Firefox. No configuration, no passwords, and no bookmarks.

The help to restore previous bookmarks does not work, presumably because the file was deleted with everything else in Program Files (x86)/Mozilla Firefox.

You should not force an update that will cause the user to lose work -- never, ever.

If you're going to move the installation directory, the user should get a chance to backup first. I did not get that chance and I've lost work. Further, I've lost confidence in your product. I can no longer recommend Firefox to others as I've done for decades.

This is not a good day for you and your product.

Hi,

In the latest firefox update 149, no start pages are displayed that were distributed with a registry key via group policy. It only works again if you change this setting manually in the Firefox settings.

In Version 148 it´s fine.

Jan

Hello,

I recently heard about an app called “Bombitup” that can send a large number of SMS messages repeatedly to a phone number. I am concerned about how such tools might be used for spam or harassment.

My question is: Can tools like this affect online privacy or browser security in any way? Also, are there any settings or features in Firefox that can help protect users from spam-related websites or services connected to such tools?

I would appreciate any advice on how to stay safe online and avoid potential spam or abuse.

Thank you.

When logging into microsoft web apps using Firefox 140.9.0esr (aarch64) on my MacBook Pro, I get an error message reading "Bad Request - Header Field Too Long. HTTP Error 400. A request header field is too long." This error page loads after I sign-in using my workplace credentials on the sign-in page. For example, going to outlook.office365.com/mail.

I've done some searching online already for solutions and have tried: 1) turning off enhanced tracking protection for this site 2) turning off all browser add-ons and extensions 3) regenerating the cookies4.sqlite* files in the Firefox Profiles folder 4) starting in "Troubleshoot Mode"

The only thing that's worked has been to start Firefox in the mode where windows are not private, and then select "New Private Window" from the File menu. Within that window I can log in successfully to Microsoft Web Apps. BUT, when I turn on "Always Use Private Browsing Mode" in the settings and restart firefox, I get the "Header Field Too Long" error message even though the browser window is private. I'd like to run in Always Use Private Browsing mode.

Ideas and help? TIA Dave

My system: Firefox 140.9.0 esr (aarch64) MacBook Pro, Mac14.6, Apple M2 Max with 12 cores, 32 GB memory macOS 26.3.1

Hi,

just downloaded the latest Policy Templates in Version 7.7 and installed them in our Central Policy Store. I went through all the settings but cannot find a configuration allowing us to block downloads of eg. executable files .

Even safebrowsing is not included to configure.

Any ideas?

I am trying to use group policy to block all extensions from being installed and only allow approved extensions.

I have followed the article:

https://firefox-admin-docs.mozilla.org/reference/policies/extensionsettings/

And here is my JSON config but it doesnt seem to be working and I can still install any extension.

{

 "*": { 

"blocked_install_message": "Please email the IT Helpdesk if you think an extension should be unblocked.", "installation_mode": "blocked" }, "com.abr.startapp@adminbyrequest.com": { "installation_mode": "force_installed", "install_url": "https://addons.mozilla.org/firefox/downloads/latest/admin-by-request/latest.xpi" } }

Please can anyone advise or confirm if this is a bug.

We are using firefox version 147.0.4 (64-bit)

Thanks

Hi,

When switching from FF 128esr to 140esr our customers noticed a massive impact in performance for certain webapplications. All Applications effected heavily use pdf-files, users are working mostly exclusive in firefox. Performance is ok when the day starts but gets bad fast. Sooner or later working is no longer possible and firefox needs to be restarted.

The users work on Citrix Desktops, but difference in performance is also seen in Firefox localy (not as bad but its there). Cross-tests with another browser are not possible, because the application works only in FF.

We tried removing almost all policies effective to rule out a specific hardening setting We tried every setting we could find linked to cache (as it seemed related to that) but without success. We collected logs with the Firefox-internal Tools but could not identify a specific Problem.

Any Help is apreciated, thx in advance

Hello, For FF on Linux running in KIOSK mode, is there a way to allow the user to perform a refresh like you can do in normal mode by pressing F5 ? This seems to be disabled in KIOSK mode.

Thank you, Tom

We are currently rolling out a profile management solution based on Ivanti User Environment Manager. In order to configure file includes and excludes in the profile management tool, we have to “standardize” the Firefox profile path in the filesystem. We have implemented a PowerShell script, which reads the currently used profile from %appdata%\Mozilla\Firefox\install.ini, renames the appropriate profile subfolder to “firefox.default-esr” and replaces the entries in installs.ini and profiles.ini.

The script seems to be reliable. However, for around 10% of the users, we are seeing issues when the user launches Firefox after the “firefox profile migration” happened. Firefox opens but none of the GUI controls is accessible. Firefox is completely unusable. See screenshot attached.

We do have workarounds to resolve this issue, such as completely wiping the %appdata%\Mozilla\Firefox folder and let Firefox re-build everything from scratch. But we are still trying to find the root cause the issue, because our customers have more than 100k clients, what will be a big impact and hard to handle for the helpdesk.

We are currently unable to reproduce the issue on test clients. Even copied Firefox profile folders form affected clients don’t show the issue on other clients.

Therefore we want to find out and ask for your help:

- Is there a supported way to “standardize” the filesystem folder name of the Mozilla Firefox (ESR) profile of a user? - What are the files within a Firefox profile that are required for the profile and the application itself to properly start? - Do you have any idea which files in a Firefox profile (in a corrupted state) could cause our issue?

I would like access to Firefox Stories but the policy setting for FirefoxHome Stories is false. How do I get to these settings to change the false to true?

Until about a week ago the stories showed up on the New Tab. There is a side section on New Tab for customizing and the section had an option to see the stories. Now that section has no reference to the option.

Any suggestions?

Thanks,

Cree una política para filtrado web donde bloquea por ejemplo páginas de juegos de azar, sin embargo, varias páginas las está dejando abrir, para contrarestar eso, por medio de indicadores bloquee las páginas que deja pasar pero aún así está dejando abrir ciertas páginas, por ejemplo betplay, para solventar eso apliqué una política de filtrado web, para esto importé el admx de Mozilla, sin embargo en Mozilla todavía está dejando entrar a esa página.

Is there a way to push a policy that will allow device and apps and local netwrok access via MDM (https://support.mozilla.org/en-US/kb/control-personal-device-local-network-permissions-firefox)? We need to allow Firefox to access an app agent that is running on a device via localhost. We would like to do it with a macOS profile, Windows GPO and a json policy for linux. I can't seem to find this setting in policy templates.

Dear Agent, My computer has been updated to Windows 11 from Windows 10. The Firefox profile settings has not changed from Windows 10 to Windows 11. How can I edit or update to Windows 11 in my Firefox profile?

Regards,

I've been tasked with removing Firefox from all Windows workstations in our enterprise environment. Our users don't have local admin, so when they install Firefox, it is installed in the user's profile.

I've just installed Firefox 143.0.1 in my own user profile for testing purposes. However, when I attempt to uninstall, either from Control Panel or by running %localappdata%\Mozilla Firefox\uninstall\helper.exe manually, UAC prompts for elevation, even though I installed without elevating.

I've dug in a bit more, and I found this was an issue five years ago as well:

https://support.mozilla.org/en-US/questions/1286070

According to that post, the issue was resolved, but it seems to have come back.

Any help would be appreciated.

How to disable Firefox add-ons in order to block to install temporary extensions. I am generating policies via Firefox Policy generator. {

 "name": "myconfig",
 "time": "2025-12-14T13:17:27.479Z",
 "configuration": {
   "arrayfields": {},
   "checkboxes": {
     "BlockAboutAddons": true,
     "BlockAboutConfig": true,
     "BlockAboutProfiles": true
   },
   "input": {},
   "textareas": {},
   "select": {}
 }

}