Allow certain add-ons/themes to not sync across browers.

[WoodwardIII]

Add a box you can uncheck on the 'Manage extension' page next to each addon/theme to disable them from syncing with other browsers on your account.

This would be useful in at least two places:

• Setting different themes in nightly so is visually obvious which Firefox is open (I daliy normal FF but use nightly for testing code)
• Only have performance add-ons were needed (eg h264ify on my old pc but not my new laptop)

Seriously Firefox devs, PLEASE add this, the lack of it is a problem for me every day, and when I switch computers I need to manually toggle about 5 things off and on just to do work (and by work I mean the all-important pastime of video watch).

[Jon]

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[Username0815]

Workaround
If youre looking for: Disable sync theme across Programs or PCs inside about:config:

Set to false:

• services.sync.prefs.sync-seen.extensions.activeThemeID
• services.sync.prefs.sync-seen.services.sync.prefs.sync.extensions.activeThemeID
• services.sync.prefs.sync.extensions.activeThemeID

Set to true:

• services.sync.addons.ignoreUserEnabledChanges

It may only work with the last one because some of the settings seem to be discontinued. I didnt want to try all cases so i disabled all of them.

Sources

• https://support.mozilla.org/en-US/questions/1372066
• https://support.mozilla.org/en-US/questions/1381032

If this disables more than just themes pls let me know