Is it possible to, on install, disable update checking and prevent Firefox from installing updates? We intend to install updates in a controlled manner using SCCM. Thank you very much for your help!

3 Answers 3


I know that this is an old question, but nowadays (65.0.2) disabling updates is relatively complicated. Here's the solution:

  1. In the firefox application directory, create a directory named distribution. On Windows, create a directory called distribution where the EXE is located. On Mac, the location is Firefox.app/Contents/Resources/distribution. On Linux, the location is firefox/distribution, where firefox is the installation directory for firefox, which varies by distribution, but is often /opt/firefox.
  2. Inside distribution, place a filed named policies.json containing the following:

        "policies": {
            "DisableAppUpdate": true




Note: I can only vouch for the Windows solution because I have tried it and it worked. The others are imported from the links.


You can change your automatic installation setting by using this

Tools -> Options -> Advance -> Update

and change the option according to your purpose.
The above only affects your own account.
To do it for all, you can place a file the file "local-settings.js" in the defaults\pref folder to specify mozilla.cfg.


  • This race condition, To stop update. Lunch the application and change the option before it automatically update Nov 15, 2018 at 9:53

Put an exclusion for the Firefox update site in /etc/hosts, or block that site at your firewall. Then none of the machines will be able to get to it at all and you can deploy updates as you wish.

Bring up Firefox, go to about:config and check the contents of "app.update.url". Then block that site / IP address. I suspect that Mozilla rotates IP addresses on that FQDN so blocking it by IP address might be a bit tricky. Easier to block it in /etc/hosts, though you would need to push a hosts file to every system.

At present the update server appears to be "aus5.mozilla.org" (both from the Mozilla discussion at the link below, and from my own browser) but this could change (a) according to region or (b) with the next release.

See also: https://support.mozilla.org/en-US/questions/1224757

  • Great answer. I just went to about:config and deleted the value of the "app.update.url"
    – user674669
    Aug 23, 2019 at 4:45

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