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We recently update Firefox with version 138.0 and now getting the message "Gah. Your tab just crashed" when opening the browser.

We attempted to update and install version 138.0.1 only resulting with the same error. We also found and attempted the following all resulting with the same error: - change the about:config page for settings to false for both browser.tabs.remote.autostart and browser.tabs.remote.autostart.2

- clear browser cache.

- enable Temporary Mode in the Help menu. This appears to fix the problem but only for the current browser session. When a new Firefox window is opened, the error reappears.

What is needed to resolve this error or is there a way to permanently enable Temporary Mode or some similar setting? Thanks for all your help with this.

The recommended methods, changing to this in the registry :

[HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Mozilla\Firefox\Certificates] "ImportEnterpriseRoots"=dword:00000000

Reverts back to 00000001

Put this policies.json and did nothing: {

 "policies": {
   "Certificates": {
     "ImportEnterpriseRoots": false
   }
 }

} What am I missing or what's changed?

My specific need at the moment is to add another search engine option in about:preferences#search

Thanks.

After updating to v132 I have noticed a significant increase in the load times for some websites that our users connect to. Using v131.0.3 I usually see < 1 second load times for the two websites I am monitoring but after upgrading to v132 it is consistently taking 18-19 seconds for the same page. I have tried uninstalling v132 and reverting to v131 and it immediately goes back to the much faster load times. I have also tried installing various v133 releases and I see the same performance issue as for v132.

The environment I am working in is behind a network firewall with relatively restrictive internet access and I am wondering whether there are sites that Firefox is trying to connect to for the new anti-tracking or suspicious activity features (or anything else) that are being blocked and are therefore causing timeouts and retries that are bumping the total load time up.

Can anyone think of anything else I could check or change?

Recently we've began installing Firefox 140.2.0esr to our environment via the .msi file that Mozilla provides, however we're running in to a very odd incident.

After approximately 24 hours from installing Firefox esr to devices, it appears that the application is "updating" to 141.0.3 on the "release" channel. As far as I'm aware, this shouldn't be possible to begin with. But we've applied these settings via GPO:

Computer Config > Policies > Admin Templates > Mozilla > Firefox Application Autoupdate = Disabled Pin updates to a specific version = Enabled = Set to 140.2.0 Background updater = Disabled Disable Update = Enabled Manual Update Only = Enabled

After applying the GPO, confirmed this appears within the registry:

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Mozilla\Firefox\ AppAutoUpdate = 0 AppUpdatePin = 140.2.0 BackgroundAppUpdate = 0 DisableAppUpdate = 1 ManualAppUpdateOnly = 1

At this point, I'm at a loss. We cannot have rapid release be what's installed in our environment. Is there something broken with 140.2.0 or are we doing something wrong here?

Hello,

New subscriber here. I have been given the task to test the install and uninstall of the Purview Firefox browser extension using Intune. I created 2 groups in EntraID, one for each (install and uninstall).

I have no issues with the installation. Initially, I left the test device in the install group and then added it to the uninstall group to remove it. (this usually works with other apps, it worked this way with the Purview Chrome browsing extension as well other apps) but when I do this, nothing happens.

Next, I removed the device from the install group and added it to the uninstall group only. Once the configuration profile applies to the test device, it allows the user to remove it manually (before it did not) but the extension remains installed.

I have created a policy using the administrative template extension uninstall option as well as with the OMA-URI settings but the same happens. When i check the device configuration for the device in Intune, it says it succeeded but that is not the case. The OMA-URI setting I was not too sure about, but gave it a shot. I used the UUID value for the Purview Firefox extension

I am attaching some pictures and hope someone can tell me what I am doing wrong. I can add additional information, if needed. I have opened a ticket with Microsoft last week but have not called me yet. I ran into this forum today.

Thanks in advance

Hello community :)

hope everybody is doing well. I´m coming here with with asking for a help.

I´m managing browsers (Google Chrome, MS Edge and Firefox) in my company via GPOs. What we´ve been dealing with since 135 version came up is having the "Did Not Connect: Potential Security Issue error page , Error insufficient cert transparency" while visiting our internal resources.

Despite of having the security.pki.certificate_transparency.disable_for_spki_hashes set up -> main three certificate hashes are correctly added, basically copying the setup from Chromium browsers , where everything works as expected , Firefox is not.

The only way how to make it work is via security.pki.certificate_transparency.disable_for_hosts , which is , of course, not desirable , because of the security risks.

Does anyone face the same issues ?

Thank you very much ya´ll

Hey everyone. I am automating end-to-end testing with playwright for python, using the official Docker image from the microsoft artifact repository (using `playwright/python:v1.49.1`).

As I have signed certificates for my local domains with my own certificate authority, I am trying to have Firefox automatically install the certificates via a policies file. However, Firefox seems to ignore the policies file no matter what.

To ensure that the file itself is used, I simplified it to a single boolean value, and ensured that it's copied correctly inside the container via the `cat` command. Here are the current contents:

{

 "policies": {
   "DisableTelemetry": true

}

I know that the CA certificate is installed correctly, as it works out of the box using the WebKit browser and Curl command. I have gotten it to work in Chromium by installing it to nssdb using `certutil`.

I have converted the file from ASCII to the `utf-8` charset.

The file has the expected content, and I have copied it to both `/etc/firefox/policies/policies.json` and `/ms-playwright/firefox-1466/firefox/distribution/policies.json` (the path to the binary is `/ms-playwright/firefox-1466/firefox/firefox`).

Opening `about:policies` shows the text "The Enterprise Policies service is inactive.", which is sadly not very informative. It would be nice to have a list of locations it looks in, and any problems it encountered.

The container uses Firefox Nightly 132.

Are these locations incorrect? Is there any way to debug this? Does anyone have any other suggestions? If you need any more info (Dockerfile, etc.), please let me know.

Thanks in advance.

Dear Team,

When my Client device installs From Firefox 102.7.0 ESR to Firefox 128.7.0 from SCCM. (The case is First install the Version 102.7.0 then save the Bookmarks and then uninstall. Second Install the 128.7.0 then check the bookmarks)

user profile Bookmarks are not mapped in Firefox. When I check C:\Users\Tests\AppData\Roaming\Mozilla\Firefox\Profiles I can see the xxxx.defaultesr

I don't understand why the bookmarks are not linked in Firefox. Can you please help? I would be thankful to you if you could share me the .bat script

Thank you

Hi all,

For quite a while I'm working together with others on a voluntary base (nobody gets money) as members of a computer-club, a charitable NGO and NPO (in German: gemeinnütziger Verein) for seniors in order to bring them closer to the use of digital devices and media. It's not only teaching, but administrating the hard- and software as well.

I can remember that it was possible in former versions of Firefox to include at least a script into "defaults->prefs". I think it was user.js (not sure) in the installation folder to define common preferences to be fixed, like proxi settings. It always worked well, preventing non-privileged users from making any unwanted changes. As a I found out there must have been a very similar way to include add-ons (like uBlock Origin).

Unfortunately all content I found was older than about 10 years. When trying setting up Firefox as it is now, my test system didn't care about anything I've tried.

I'm talking about > 50 Windows-PC having in average 3 user profiles each (for teaching more than 400 members). We are amateurs regarding PC administration, except some network ex-professionals. "Baking" installation media including our needs, as I already found on Mozilla's pages, seems to be beyond our abilities as well as distributing a fitting profile (we don't have a MS-server), not speaking about Group Policies.

Is there any usable guideline for people like us? Today, each FF-installation looks different and I would like to unify this as easy as possible.

Hello,

For enterprise solutions, for our browser extension can we disable the switch button where user can turn-off the "Access your data for all websites"?

This can be informed to the end user and also approved by the IT admins.

But the option to disable at runtime on the fly needs to be disabled.

How do I lock the Microsoft Purview settings in the attached image using intune, so users cannot change them.

I have been able to make it that they cant disable or remove the extension but cannot figure out how to make it that they cant change the settings. I did try making a json file but it does not seem like Firefox uses it.

I am logged on to my Credit Union and attempt to download my statements. When using Firefox I get the message: {"Errors":["Authorization has been denied for this request."]}

When I contacted my CU, they said to add an URL to the Manage Exceptions. This worked, but I want to know why Firefox needs this but Chrome doesn't.

I would like to know how the Firefox CVEs are affected on its version which are mentioned in NVD.

Let take mfsa2025-59, for example CVE-2025-8040, as per the NVD its says Firefox ESR < 140.1 is affected so does that mean it affect all the version which are lower than 140.1 which included the ESR 128 and ESR 115 versions or just the ESR 140 version series? then it raise on more question check this cve-2025-8029 in NVD it has specifically mentioned it only affect "Firefox ESR < 128.13, Firefox ESR < 140.1" and not the ESR 115 versions. Could anyone confirm it does not affect the ESR 115 versions or it affect all the versions? Now check this one cve-2025-8027, NVD clearly mentioned "Firefox ESR < 115.26, Firefox ESR < 128.13, Firefox ESR < 140.1" are affected so what I understand is that if the Firefox ESR 115 is vulnerable to any CVE it would be mentioned in the NVD specifically.

My point is that if any Firefox CVEs are listed in NVD and it specify only one version like “Firefox ESR < 140.1” what does that mean? Does it affect all the versions which include ESR 128 and ESR 115 or just the ESR 140 series version only affected? If any CVEs are affected on the ESR 115 and ESR 128 does Mozilla specifically mentioned those versions are affected right? Just like its mentioned in the cve-2025-8027

Any help would be appreciated to clarify this.

In /Library/Preferences/org.mozilla.firefox.plist:

``` <plist version="1.0"> <dict> <key>EnterprisePoliciesEnabled</key> <true /> <key>ExtensionSettings</key> <dict> <key>cloudmetering@snowsoftware.com</key> <dict> <key>install_url</key> <string>https://raw.githubusercontent.com/SnowSoftware/agent-firefox-extension/refs/heads/main/cloudmetering-v1.2.3.xpi</string> <key>installation_mode</key> <string>force_installed</string> </dict> </dict> </dict> </plist>```

In about:policies: {"cloudmetering@snowsoftware.com":{"installation_mode":"blocked","install_url":"https://raw.githubusercontent.com/SnowSoftware/agent-firefox-extension/refs/heads/main/cloudmetering-v1.2.3.xpi"}}

The plist file did read "blocked" at one point, but it no longer does. Why isn't firefox picking up the new value from the plist file? Restarting/refresing FF has not helped so far.

Hello. I know how to define a server certificate exception to avoid browser warnings in case of certificate issue with a website (see attachment). However, I'd like to apply that exception for all users with access to my machine using a GPO (for user or local machine). This is also a requirement in my work where many users run Firefox from a server and the face browser warnings all the time (related to self-signed certificates) so it would be great to apply an exception for all users through a GPO specifying the self-signed certificate warning we want Firefox to ignore. Thanks.

I have a lot of Firefox windows and tabs open, and I really don't want to lose my session.

I wanted to open a webpage in Firefox in fullscreen mode. But evidently there's some kind of serious flaw in Firefox that makes it incapable of opening webpages in fullscreen mode. Everyone says the only workaround is to open the webpage in kiosk mode. So I tried it.

But now I have two big problems:

1. One of my Firefox windows, with all its tabs, is stuck in kiosk mode. (Even if I close the window and then restore it with Ctrl+Shift+T, it's still in kiosk mode.)

2. All new Firefox windows I open with Ctrl+N are also stuck in kiosk mode.

I don't know what to do, and I'd really appreciate any help. Thanks!

Current version of Firefox has

    (1) popups to get me to download a new version,
    (2) tab pickup,
    (3) popups to show
    article titles,
    (4) popups to show
    current URLs.

I just want to download the install programs until I get the most recent one that has none of (1) - (4).

I need to go back 1, 3, 5, 10 years?

So where on the Internet should I go to get such an old Firefox install program?

I used to really like Firefox, but changes (1) -- (2) have ruined it for me.

Hi. On an Active Directory, we deploy Firefox (normal or ESR). It's OK. When we deactivate the link of the GPO, it's supposed to uninstall. But it doesn't (even if we delete the GPO, specifying to uninstall at once).

The gpresult command on each computer doesn't show the GPO anymore, but Firefox is still installed.

( FYI, we used to do that with FrontMotion Community Edition, and it was always working (instal and uninstal). We even just tried the "last" (but old) ESR edition present on the FrontMotion site (CEESR-102), and it works. But FM CE version has stopped being developped. )

So, any idea about why the official Mozilla Firefox version (normal or ESR) doesn't uninstall?

Thanks by advance.

Hi Firefoxians,

I need to ask regardining this security.cert_pinning.enforcement_level. how can i set this value using the windwos server GPO? i could not find this even after copying the firefox.admx file. could someone please guide me how can i acheive it?

I would really appreciate the help!

Regards Sheras