As I work towards rolling out FF91esr to 250 PCs, and having the UI almost usable, I need to be able to integrate a number of preferences to each browser. Does the group policy cover EVERY preference available? I read on gHacks that Mozilla ripped out yet another feature - the ability to use the user.js preferences file. I must admit, I haven't confirmed this yet as I've only just finished reading it. I believe the user.js could not lock settings anyway? I do have about 80-100 settings that I want to integrate. I can't simply replace their prefs.js because they will have undoubtedly set some preferences for themselves, which we do not forbid (yet). So, without wiping out any preferences users may have set for themselves, how can I integrate the settings I need, assuming the GPO doesn't cover every conceivable preference? disclaimer: Yes, I realize it is possible that some of the settings I'm going to integrate *might* conflict with preferences they've set for themselves. That will be dealt with internally by policy communications.