Will policies I set work if users already installed Firefox?

This article is for IT Admins who want to configure Firefox on their organization's computers.

Yes, as long as you’re both using a recent version of Firefox.

On Windows, policy support for Firefox is implemented using Group Policy. All Firefox policies set using Group Policy will be implemented on Firefox versions 60 and later, even if a user has already installed the program on their computer.

Read the customizing Firefox using Group Policy support article to learn more.

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