Firefox for Enterprise Community Forum

Until recently the Firefox docs described how to use the CDP-based Remote Agent at [this url](https://firefox-source-docs.mozilla.org/remote/cdp/Usage.html), now defunct. Here is the latest archive version I can find from the end of last year: https://web.archive.org/web/20241126214503/https://firefox-source-docs.mozilla.org/remote/cdp/Usage.html

One usage example looked like this:

% firefox --remote-debugging-port DevTools listening on ws://localhost:9222/devtools/browser/7b4e84a4-597f-4839-ac6d-c9e86d16fb83

I have tried the same but get no websocket address returned:- ``` % firefox-esr Mozilla Firefox 128.11.0esr ``` ``` % firefox-esr -h ... ... --remote-debugging-port [<port>] Start the Firefox Remote Agent,

                    which is a low-level remote debugging interface used for WebDriver
                    BiDi and CDP. Defaults to port 9222.

... ... ```

`% firefox-esr --remote-debugging-port` command exits with nothing returned

I have `remote.active-protocols` set to 3 in my Firefox prefs.

Please advise how I get the Remote Agent to return a websocket address for use with BiDi with FF 128. My OS is Debian-based Linux.

TIA

I am a DNS administator at my employers and notice that on my employers network that aus3.mozilla.org and aus4.mozilla.org seem to be returning NXDOMAIN both with our on prem DNS and via the public dns providers when a browser attempts update it can fail.

Have other Australian users reported such behavior and are these hosts still valid

DIG

grudd@crayon:~$ dig @8.8.8.8 aus3.mozilla.org

<<>> DiG 9.18.30-0ubuntu0.20.04.2-Ubuntu <<>> @8.8.8.8 aus3.mozilla.org

(1 server found)

global options: +cmd

Got answer:

->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 40382

flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 1

OPT PSEUDOSECTION:

EDNS: version: 0, flags:; udp: 512

QUESTION SECTION:

aus3.mozilla.org. IN A

AUTHORITY SECTION:

mozilla.org. 2 IN SOA infoblox1.private.mdc1.mozilla.com. hostmaster.mozilla.com. 2024020614 180 180 1209600 60

Query time: 0 msec

SERVER: 8.8.8.8#53(8.8.8.8) (UDP)

WHEN: Mon Jun 02 10:04:52 AEST 2025

MSG SIZE rcvd: 126

grudd@crayon:~$ dig stun.services.mozilla.com

<<>> DiG 9.18.30-0ubuntu0.20.04.2-Ubuntu <<>> stun.services.mozilla.com

global options: +cmd

Got answer:

->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 56679

flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 1

OPT PSEUDOSECTION:

EDNS: version: 0, flags:; udp: 1280

QUESTION SECTION:

stun.services.mozilla.com. IN A

AUTHORITY SECTION:

services.mozilla.com. 836 IN SOA ns-679.awsdns-20.net. awsdns-hostmaster.amazon.com. 1 7200 900 1209600 86400

Query time: 0 msec

SERVER: 10.67.10.62#53(10.67.10.62) (UDP)

WHEN: Mon Jun 02 10:13:11 AEST 2025

MSG SIZE rcvd: 138

grudd@crayon:~$ dig @8.8.8.8 stun.services.mozilla.com

<<>> DiG 9.18.30-0ubuntu0.20.04.2-Ubuntu <<>> @8.8.8.8 stun.services.mozilla.com

(1 server found)

global options: +cmd

Got answer:

->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 62337

flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 1

OPT PSEUDOSECTION:

EDNS: version: 0, flags:; udp: 512

QUESTION SECTION:

stun.services.mozilla.com. IN A

AUTHORITY SECTION:

services.mozilla.com. 127 IN SOA ns-679.awsdns-20.net. awsdns-hostmaster.amazon.com. 1 7200 900 1209600 86400

Query time: 0 msec

SERVER: 8.8.8.8#53(8.8.8.8) (UDP)

WHEN: Mon Jun 02 10:13:19 AEST 2025

MSG SIZE rcvd: 135

grudd@crayon:~$ dig @8.8.8.8 aus4.mozilla.org

<<>> DiG 9.18.30-0ubuntu0.20.04.2-Ubuntu <<>> @8.8.8.8 aus4.mozilla.org

(1 server found)

global options: +cmd

Got answer:

->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 15261

flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 1

OPT PSEUDOSECTION:

EDNS: version: 0, flags:; udp: 512

QUESTION SECTION:

aus4.mozilla.org. IN A

AUTHORITY SECTION:

mozilla.org. 40 IN SOA infoblox1.private.mdc1.mozilla.com. hostmaster.mozilla.com. 2024020614 180 180 1209600 60

Query time: 4 msec

SERVER: 8.8.8.8#53(8.8.8.8) (UDP)

WHEN: Mon Jun 02 10:24:30 AEST 2025

MSG SIZE rcvd: 126

grudd@crayon:~$ dig @8.8.8.8 aus4.mozilla.org

<<>> DiG 9.18.30-0ubuntu0.20.04.2-Ubuntu <<>> @8.8.8.8 aus4.mozilla.org

(1 server found)

global options: +cmd

Got answer:

->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 26928

flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 1

OPT PSEUDOSECTION:

EDNS: version: 0, flags:; udp: 512

QUESTION SECTION:

aus4.mozilla.org. IN A

AUTHORITY SECTION:

mozilla.org. 35 IN SOA infoblox1.private.mdc1.mozilla.com. hostmaster.mozilla.com. 2024020614 180 180 1209600 60

Query time: 0 msec

SERVER: 8.8.8.8#53(8.8.8.8) (UDP)

WHEN: Mon Jun 02 10:24:32 AEST 2025

MSG SIZE rcvd: 126

grudd@crayon:~$ dig @8.8.8.8 aus5.mozilla.org

<<>> DiG 9.18.30-0ubuntu0.20.04.2-Ubuntu <<>> @8.8.8.8 aus5.mozilla.org

(1 server found)

global options: +cmd

Got answer:

->>HEADER<<- opcode: QUERY, status: NOERROR, id: 37023

flags: qr rd ra; QUERY: 1, ANSWER: 3, AUTHORITY: 0, ADDITIONAL: 1

OPT PSEUDOSECTION:

EDNS: version: 0, flags:; udp: 512

QUESTION SECTION:

aus5.mozilla.org. IN A

ANSWER SECTION:

aus5.mozilla.org. 48 IN CNAME balrog-aus5.r53-2.services.mozilla.com. balrog-aus5.r53-2.services.mozilla.com. 58 IN CNAME prod.balrog.prod.cloudops.mozgcp.net. prod.balrog.prod.cloudops.mozgcp.net. 984 IN A 35.244.181.201

Query time: 4 msec

SERVER: 8.8.8.8#53(8.8.8.8) (UDP)

WHEN: Mon Jun 02 10:24:43 AEST 2025

MSG SIZE rcvd: 163

grudd@crayon:~$ dig @8.8.8.8 aus5.mozilla.org SOA

<<>> DiG 9.18.30-0ubuntu0.20.04.2-Ubuntu <<>> @8.8.8.8 aus5.mozilla.org SOA

(1 server found)

global options: +cmd

Got answer:

->>HEADER<<- opcode: QUERY, status: NOERROR, id: 65395

flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 1, ADDITIONAL: 1

OPT PSEUDOSECTION:

EDNS: version: 0, flags:; udp: 512

QUESTION SECTION:

aus5.mozilla.org. IN SOA

ANSWER SECTION:

aus5.mozilla.org. 42 IN CNAME balrog-aus5.r53-2.services.mozilla.com. balrog-aus5.r53-2.services.mozilla.com. 52 IN CNAME prod.balrog.prod.cloudops.mozgcp.net.

AUTHORITY SECTION:

balrog.prod.cloudops.mozgcp.net. 300 IN SOA ns-cloud-d1.googledomains.com. cloud-dns-hostmaster.google.com. 1 21600 3600 259200 300

Query time: 108 msec

SERVER: 8.8.8.8#53(8.8.8.8) (UDP)

WHEN: Mon Jun 02 10:24:49 AEST 2025

MSG SIZE rcvd: 237

grudd@crayon:~$

I'm using Firefox ESR 128.10.1esr on Kali, and I'm encountering an issue where the 'Refresh Firefox' option is missing from the ☰ → Help → Troubleshooting more Information. This is preventing me from restoring Firefox to its default settings. I've already tried the following:

   Restarting Firefox

   Clearing the startup cache

   Confirmed there are no extensions installed

None of these steps have fixed the issue. I need a way to reset Firefox ESR to factory defaults, but I can't find an option to do so. Attached is a screenshot of the Troubleshooting Information page.

Any assistance would be greatly appreciated!

I confirmed this problem on two separate computers(windows 7 and windows 11) and version 115.23.0 of Firefox ESR can not properly play streams on twitch.tv

Audio will play, but the video does not load with only a black screen with question mark icon replacing video feed.

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.

Hello,

Our organization is attempting to implement a Conditional Access policy that restricts access to certain websites to Intune joined devices only. The error message mentions that I need to enable a setting from within Firefox called Windows SSO, mentioned here: https://support.mozilla.org/en-US/kb/windows-sso. This setting is already enabled and I am still getting an error.

Is there anything else that could be causing this?

Добрый день Есть ли возможность установить плагин .xpi в mozilla через cmd. AltLinux. Конечно я уже прочел статьи существующие. Не сработали рекомендации. Можно ли сделать вывод что Firefox 128.0 ESR не поддерживает установку плагинов через cmd? Если да, то можем ли мы сослаться на официальный ответ firefox ? Благодарю за рекомендации.

I am going to deploy Firefox ESR in an environment where the default topsites provided by the top-sites.json included in omni.ja (namely Wikipedia, youtube and reddit) are not desirable, and I want to provide my own. I cannot find a way to do so.

Setting the browser.newtabpage.activity-stream.default.sites preference through the policies.json file does not work (the pref gets loaded but it does not influence the actual default topsites, which is not surprising since the default value of this pref has nothing to do with the actual default topsites).

Note that I am not seeking to remove the topsites from the homepage entirely (as would be achieved through the FirefoxHome/TopSites policy), I want to change the default ones.

I tried creating my own top-sites.json in /lib/firefox-esr/browser/ where omni.ja resides, but to no avail.

Hi, we use Firefox 128.9.0esr (64bit) on about 6000 workstations. We redirect the stored bookmarks on a personal network drive for each user. For that we use these settings via Windows group policy:

browser.bookmarks.file = P:\Firefox\Bookmarks browser.bookmarks.autoExportHTML = true browser.places.importBookmarksHTML = true

For some time the automatic export/import with that settings above does not work any more. When I close Firefox on workstation A, the bookmarks seem to be exported correctly in that export-file (check the file via editor). But when I use another workstation B an start Firefox, the exported file does not import on startup. But this worked fine in the past.

I found out, that the switch "browser.places.importBookmarksHTML" is obviously automtically set to false when I have startet Firefox (checking with about:config). I dont know if it is correct.

Any suggestions? Maybe it's a new bug?

Thanks Malte

I am trying to manage Firefox browser for our users with MDM. On doing so, I can't able to get expected output on blocking the camera access for certain websites with the following OMA-URI.

./Device/Vendor/MSFT/Policy/Config/Firefox~Policy~firefox~Permissions~Camera/Camera_Block

I can add websites in allow section and even lock the setting so that the users can't change. But facing issues with blocking camera access.

Is there any place where I can see the log if there are any error encountering by any chance? Any insights or suggestions would be greatly appreciated.

Thanks in advance!

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.

Hi, I keep getting a message that I should update to a newer version of Firefox on Ubuntu. The problem is: I click on the install for 64 bit button, A ...tar.xz file downloads to my desktop, and the process ends completely. How to proceed?

Thanks, Ildikó

Hello everyone,

We have been using Mozilla Firefox ESR (32-bit) in the organization for several years. For installation on our clients, we use "Matrix42 Empirum" as the software distribution tool. All it does is install the MSI of Firefox.

However, for quite some time now (almost 2 years), we have been facing an issue where some installations are marked as successful (Error code 0), but once the MSI installer is automatically closed, files like "firefox.exe" disappear from the installation directory – despite the installation being marked as successful.

The problem doesn’t always occur, but a repair attempt usually resolves the issue.

In addition to Empirum, we also use Defender for Endpoint, but we couldn’t find any clues there.

Is this problem known, or are we the only ones experiencing it?

When a user logs onto the PC, FF creates the Task scheduler folder but not the task inside. This only get created once the user opens FF for the first time.

So as an admin how would I manage the updates for FF when the user never opens Firefox?

We are currently considering using Firefox ESR as our default browser but experiencing a few issues and one of them is with our configured SailPoint IdentityIQ Single Sign-On Experience, which uses Basic Authentication.

Issue Description First, the login button needs to be clicked multiple times before access to the site is granted. Once signed in, the Firefox inbuilt authentication dialogue appears, prompting the user to log in again (see the attached screenshot). The landing page is only presented after clicking the login button several times. This creates a poor user experience, sometimes causing pages to load improperly. Interestingly, the same process works seamlessly in Edge Chromium.

Troubleshooting Steps Taken I have already attempted the following: 1. Temporarily disabled all custom and security settings in mozilla.cfg and config.json. 2. Temporarily disabled Firefox Tracking Protection. 3. Allowed third-party cookies for the specific URL. 4. Upgraded Firefox Version to 128.7.0 5. Since our Firefox browser is significantly hardened, I have also enabled and reconfigured the following settings in mozilla.cfg to ensure Basic Authentication is allowed, functions properly, and suppresses Firefox’s authentication prompt, but without success:

network.http.phishy-userpass-length = 255 network.http.use-basic-auth network.automatic-ntlm-auth.allow-non-fqdn network.automatic-ntlm-auth.trusted-uris security.enterprise_roots.enabled security.enterprise_roots.enabled

Observations from SailPoint Team Our colleagues from SailPoint have tested the setup in their environment, and according to them, it works as expected. However, their browser is not hardened, and they have leveraged the SailPoint UI for authentication instead of the built-in Firefox authentication prompt.

Further Investigation • Is there a specific configuration required in the user profile settings? • Network trace analysis shows 404 errors on GET requests and the following error codes on POST requests: • 302 Redirect: Mozilla Documentation • 408 Request Timeout: Mozilla Documentation

Next Steps Is there a specific security setting that needs to be enabled or disabled? Are there any particular Firefox enterprise policies we should modify? I have also attached screenshots for reference. Let me know if you need specific logs or network traces for further troubleshooting.

Using group policy there is various settings required for our users. We have been using the preferences policy located at: Administrative Templates > Mozilla > Firefox > Preferences

This policy requires the use of JSON, we have been using the following which has been working ok:

{ "media.navigator.permission.disabled": { "Value": true, "Status": "user" }, "browser.warnOnQuit": { "Value": true, "Status": "user" }, "keyword.enabled": { "Value": false, "Status": "user" }, "browser.tabs.unloadOnLowMemory": { "Value": false, "Status": "user" }, }

Within the old "Preferences (Deprecated)" there is a setting called "intl.accept_languages" which we are wanting to use but I can't seem to find a way to include this within the JSON. We are wanting to set it to "en-GB".

If I enable this within the old deprecated preferences section it causes the Preferences with the JSON to stop working.

I have tried various combinations of including it within the JSON but neither are working:

"intl.accept_languages": { "Value": en-GB, "Status": "user" }

"intl.accept.languages": { "Value": en-GB, "Status": "user" }

I've checked the Mozilla website here: https://mozilla.github.io/policy-templates/ There doesn't seem to be any reference for the intl.accept_languages setting to be used within the JSON

Please can someone advise?