Firefox for Enterprise Support Forum

We followed the links below to block internet access in Firefox browser:

https://www.youtube.com/watch?v=fAGYYX5hYb8 https://github.com/mozilla/policy-templates/releases

We downloaded the ADMX and ADML files. Using these files, we were able to locate Mozilla Firefox in Group Policy Management and successfully block all websites in the Firefox browser using the pattern :///*.

However, we encountered an issue with exceptions. We do not wish to block certain websites, including localhost. We attempted to use the "Exceptions to block websites" option, providing values such as ://msn.com/ to exclude specific sites. Unfortunately, this approach did not work as intended. For instance, msn.com is one of the websites we want to allow, among others and also localhost.

We require assistance with the following issue: "Exceptions to block websites" is not functioning properly within the group policy of Mozilla Firefox.

Attempting to disable FF Password manager completely for my org via a plist.

Currently have the password manager itself disabled but can't figure out how to disable the Auto-fill settings with previously saved passwords prior to the password manager being disabled?

Is this possible? Or is this disabled already when the password manager itself is disabled?

Currently have this set via a plist:

<key>PasswordManagerEnabled</key> <false/>

Hi there,

We are currently utilizing Windows Server 2019 as our development server. To maintain security protocols, we have implemented a Group Policy to block internet access on this server. Initially, this configuration successfully restricted internet access on all browsers, including Firefox. However, recently we encountered an issue where internet access became available solely through the Firefox browser, posing a significant data security risk.

Upon investigation, we discovered that Firefox allows users to modify proxy settings, effectively bypassing our Group Policy restrictions. Unlike other browsers, Firefox permits users to adjust proxy settings without sufficient rights, thus overriding our established restrictions.

To mitigate this issue, we require guidance on enforcing Group Policy settings within Firefox to prevent unauthorized alterations to proxy settings and ensure internet access remains restricted. It's important to note that Firefox is exclusively utilized for development purposes on our server.

Your assistance in resolving this matter would be greatly appreciated.

Regards, Hiten

During a client Audit earlier this week we were dinged on not having the option in Firefox ESR to block manually saving Addresses and Credit Cards. We have the autofill disabled however users can still manually add credit cards and addresses and this poses an issue with our call center agents handling Credit Card info. I'd like to be able to gray out the Saved Addresses and Saved Credit Card boxes so as to prevent agents from manually entering card data into it using a GPO or Registry setting that we can push and apply to all our domain PCs. Ideally, if we could add an entry to the JSON preferences in the Mozilla GPO that would gray those options out that'd be best but any option that removes the users ability to add CC info would be acceptable.

We are currently attempting to automate our Firefox update processes. Currently we use robocopy to push out new versions on release, but ideally we'd like to use the background updater instead. We are currently on 64-bit 119.0.1, on Windows 10 Pro 22H2. We'd prefer not to switch over to ESR if at all possible. I've already reactivated the AppAutoUpdate and BackgroundAppUpdate policies, and DisableAppUpdate is disabled, but I'm still being hit with a UAC Admin prompt when I try to launch Firefox. I tried to bypass it through the registry at [HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows NT\CurrentVersion\AppCompatFlags\Layers], with "C:\Program Files\Mozilla Firefox\firefox.exe" = "RUNASINVOKER", but that also doesn't seem to have done anything. Any and all assistance would be appreciated

Hi,

I'm blocked because for my company i have to make a GPO that will setup the default handler for pdf files. I picked up different codes on internet but it went the same way for all of them, it didn't work. Im pretty sure that's not a GPO application issue because actually all the others setings are working perfectly.

The json code was paste on the Handlers settings as u can see in the attachement.

Hopefully that i will find help there.

Cordially.

My company needs to follow regulation on Export rules. I need to provide our ITAR regulation team "Vendor documentation" regarding the Export Control Classification Number (ECCN) for Mozilla Firefox ESR. They will not accept a blog or article. Any one from Mozilla able to provide this in an official capacity?

When setting Windows to "Require DoH", firefox will not resolve DNS addresses, regardless of which "Enable secure DNS" setting is picked in FireFox security settings tab.

I expected at least "Off -- Use your default DNS resolver" to work.

If Windows is configured to just "Allow DoH", Firefox has no issues resolving DNS addresses, for any of the Firefox policy settings.

For reference, you can find the DoH policy setting in windows group policy editor, here:

gpedit.msc

Computer Configuration -> Administrative Templates -> Network -> DNS Client -> Configure DNS over HTTPS

(Have to enable it, then select Configure DoH options: Require DoH.)

you may need to issue a gpupdate /force for the setting to be picked up quickly.

Can we set up these gpo`s so that there is a check for dependencies?

Windows (GPO)

Software\Policies\Mozilla\Firefox\SecurityDevices\Add\NAME_OF_DEVICE_TO_ADD = PATH_TO_LIBRARY_FOR_DEVICE Software\Policies\Mozilla\Firefox\SecurityDevices\Remove\1 = NAME_OF_DEVICE_TO_REMOVE

Thank you.

I am an admin of some servers, i modify the proxy settings of firefox in a GPO, and it works, but now ont thing is that users can modify the settings of "No proxy for" in Connection Settings, then add the urls, then users can access to any web site which they want to, is there a method to disable this? thanks.

We downloaded the GPO Templates for AD and looking to customize Firefox.

We would like to disable Forms and Autofill: Autofill addresses Autofill credit cards

Also would like to lock down so they can't reenable if possible.

We would like to do this all through GPOs if possible. I found these in the about:config: extensions.formautofill.addresses.enabled extensions.formautofill.creditCards.enabled

But again want to do through the GPO. Is this possible?

Side note while working on GPOs, I set Exceptions for the popup blocker and they are not showing up in the browser. I also filled out to remove Search Engines but they all still appear in the browsers. These two GPO settings don't appear to be working.

We try to deploy Extension Management Settings via GPO.

Goal is to allow only whitelisted extensions, but don't block themes, dictionaries and locales.

Below find the JSON-settings deployed to the client, which should allow all themes and whitelisted extensions. Unfortunately this blocks everything except whitelisted IDs. See example screenshot with error-message, when trying to install a theme. We don't want to whitelist locales or themes, they should be still allowed for installation.

What I'm doing wrong? - Thanks for your feedback.

##############

{
"*": {
"installation_mode": "blocked",
"allowed_types": ["theme"]
},
"uBlock0@raymondhill.net": {
"installation_mode": "allowed"
},
"jid1-ZSMfwe4lCAw9oQ@jetpack": {
"installation_mode": "allowed"
}
}

Hi there,

we trying to restrict internet access that used Mozilla Firefox on client computers through Microsoft Intune.

We have already configured policy by uploading ADMX template & Custom OMA-URI as described in https://github.com/mozilla/policy-templates/blob/master/README.md 

We are trying to add custom allowed web sites to "WebsiteFilter" OMA-URI ./Device/Vendor/MSFT/Policy/Config/Firefox~Policy~firefox/B_WebsiteFilter_Exceptions. added web sites are not allowed. my question is what is the best way to enter URLs (I mean format) to allow list & how I can used wild card to allow all the web sites of one specific domain. eg:- microsoft

I am looking for information regarding the support life for settings that are defined in the Preferences (Deprecated) section of the ADMX templates provided in GitHub. There doesn't appear to be a definitive answer as to when these preferences are no longer applicable to a version of Firefox. The term "Deprecated" certainly applies they're on their way to extinction. But only a small handful of preferences have been ported over to non-deprecated template settings (like Auto Update). Is there an expected version of Firefox where all these preferences are meaningless? Or will they be supported indefinitely? "Industry recommendations' from 3rd party security vendors are bloating my policies in the domain space and I can't definitively say they are 'no longer supported as of version xyz' for all these Firefox Preference settings, which happen to be about 80% of the security parameters defined by STIG and/or CIS Workbench.

in our organisation i need several domainnames to be added in network.negotiate-auth.delegation-uris and network.negotiate-auth.trusted-uris, so that sso for some webapplications is working. some are allready in the list. when i make changes to the list, everything is working ok, but when i clos all mozilla windows and restart mozilla, the changes are gone.

Hello,

I have a problem with a pac file in our org. We download it from a server. The basic functionality is applied and it does redirect the desired traffic to the proxy. The problem occurs when the proxy goes down, it then should automaticaly start making direct connections, but the connections fail. We want to proxy only http and https and event that with some exceptions.

It was done according to https://developer.mozilla.org/en-US/docs/Web/HTTP/Proxy_servers_and_tunneling/Proxy_Auto-Configuration_PAC_file#example_6

Is there any problem with PAC file or does the browser have issues with the config?

Thanks for any help.

function FindProxyForURL(url, host) {

   /* Our proxy list */
   OURPROXY = "PROXY 172.22.59.X:3128; DIRECT"
   INOUR = "ourgroup.internal"

   /* Normalize the URL and HOST for pattern matching */
   url = url.toLowerCase();
   host = host.toLowerCase();

   /* Our Network Entry */
   if (isResolvable(INOUR)) {
       /* Don't proxy local services */
       if (isInNet(host, "10.0.0.0", "255.0.0.0")
       ) {
           return "DIRECT";
       }

       /* Proxy only http & https */
       if (url.substring(0, 5) == "http:" || url.substring(0, 6) == "https:") {
           /* Don't proxy local hostnames (without dots) */
           if (isPlainHostName(host)) {
               return "DIRECT";
           }
           /* END: Don't proxy local hostnames */
           /* START: Internal systems */
           if (shExpMatch(host, "*.example.com") ||
               shExpMatch(host, "example.com") ||
               /* END: Internal systems */
               /* START: Split VPN tunnel */
               shExpMatch(host, "*.example2.com") ||
               shExpMatch(host, "example2.com") ||
               /* END: Split VPN tunnel */
           ) {
               return "DIRECT";
           }
           /* END: Don't proxy to internal systems */
           return OURPROXY;
       } else {
         return "DIRECT";
       }
       /* END: Proxy only http & https */
   } else {
     return "DIRECT";
   }
   /* END: Our Network Entry */
   return "DIRECT";

}

Hello

I am looking for a way to disable the QUIC protocol in Firefox by GPO. I got your latest AMDX templates but I don't see the option to modify network.http.http3.enabled.

Either an AMDX template with this option or a Registry will do the trick

Thanks

on GitHub the commands are all based on Java https://github.com/mozilla/policy-templates#preferences

Is there a list of all available registry settings? Or where do these Java options come from, where can I read them out?

Environment: Windows 10 22h2 clients, latest ESR build, Domain servers Windows 2016 or better.

So I followed the guide https://github.com/mozilla/policy-templates/blob/master/README.md#extensionsettings and tried to set up the config. We are using the latest ESR build but after the settings is applied I still dont have working extensions.

Here is the code

{
     "*": {
           "blocked_install_message": "Addon or Extension is not approved. Please submit a ticket to Help Desk if you need access to this extension.",
           "install_sources": ["https://addons.mozilla.org/"],
           "installation_mode": "blocked"
     },
     "{d10d0bf8-f5b5-c8b4-a8b2-2b9879e08c5d}": {
           "installation_mode": "allowed",
           "install_url": "https://addons.mozilla.org/firefox/downloads/latest/adblock-plus/latest.xpi"
           },
     "ciscowebexstart1@cisco.com": {
           "installation_mode": "allowed",
           "install_url": "https://addons.mozilla.org/firefox/downloads/latest/cisco-webex-extension/latest.xpi"
     },
     "{d0210f13-a970-4f1e-8322-0f76ec80adde}": {
           "installation_mode": "allowed",
           "install_url": "https://addons.mozilla.org/firefox/downloads/latest/instapaper-official/latest.xpi"
           },
     "appstore-mini@feedly.com": {
           "installation_mode": "allowed",
           "install_url": "https://addons.mozilla.org/firefox/downloads/latest/feedly_mini/latest.xpi"
           },
     "extension@one-tab.com": {
           "installation_mode": "allowed",
           "install_url": "https://addons.mozilla.org/firefox/downloads/latest/onetab/latest.xpi"
           },
     "support@lastpass.com": {
           "installation_mode": "allowed",
           "install_url": "https://addons.mozilla.org/firefox/downloads/latest/lastpass-password-manager/latest.xpi"
           },
     "sweb2pdfextension.4@kofax.com": {
           "installation_mode": "allowed",
           "install_url": "https://addons.mozilla.org/firefox/downloads/latest/kofax-pdf-create-4-0/latest.xpi"
           },
     "Aternity-WebExt-12.1.4@aternity.com": {
           "installation_mode": "allowed",
           },
     "its_addons_wrap@onelog.com": {
           "installation_mode": "allowed",
           "install_url": "https://extensions.onelog.com/extension/onelog.xpi"
     }

}

I have placed the settings in HKCU but also tried in HKLM and there has been no difference. in each case I get Unable to parse JSON for Extensionsettings when checking the about:policies section and when I look at the registry I see the REG_MULTI_SZ value but when i click on it to read it I get another error message. Cannot edit ExtensionSettings: Error reading the values contents.

I tried re-entering the code and tried not listing the install URLs and even tried only listing 1 item. I haven't been able to get past this error so any help would be greatly appreciated.