If you are disabling updates, you should be using the ESR version of Firefox, https://www.mozilla.org/en-US/firefox/organizations/, which allows for regular, small security updates and once a year larger updates (which you have time for qualification). You can then either leave this on auto-update (since it will only have a potentially breaking update once a year, all other updates are security only) or use something like cck2 (https://mike.kaply.com/cck2/) to customize your deployments.

aimnfires said

As an IT technical administrator, we need to gain complete control over updates through our enterprise distribution tools, we do not want users doing any updates. I have already done all the config tweaks to disable automatic updates, but those do not disable the "Check for Updates" feature\button in Help - About. How do I also disable that feature?

Tyler Downer said

If you are disabling updates, you should be using the ESR version of Firefox, https://www.mozilla.org/en-US/firefox/organizations/, which allows for regular, small security updates and once a year larger updates (which you have time for qualification). You can then either leave this on auto-update (since it will only have a potentially breaking update once a year, all other updates are security only) or use something like cck2 (https://mike.kaply.com/cck2/) to customize your deployments.

Thanks Tyler ! I deploy the ESR version and understand the update frequency. Just would like to disable that feature for more reasons that what I stated above (i.e. deepfreeze). Thanks for your reply !