I want to remove some themes while keeping addons synchronized, because I don't want to have to reinstall them all (the ones I want to keep).

But after I remove these themes that I don't want anymore, I think the synchronization system brings them back because they appear installed after logging back to the system or even after a while.

Even more, when synchronization brings them back, one of the themes is set as enabled - when in fact I had it disabled... before removing it!

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Is synchronization supposed to act this way? Shouldn't it detect and synchronize removal just as much as installation of addons?

Can this behavior be adjusted?


This looks like a bug but I have found a workaround.

  • Uncheck the synchronization of addons.

  • Remove the unwanted addons (here, themes)

  • Restart Firefox

  • Re-anable addons synchronization (I did this in fact only after a few days)


If cirpricus' answer doesn't solve it for you, there's an alternative route to reset your sync data:

To delete all of the data associated with your Firefox sync account:

  • Go to Firefox Accounts

  • Login using the information associated with your sync account

  • Delete your account

  • Signup for a new sync account using the Firefox Accounts website or directly from Firefox

Source: Wesley Branton @ https://support.mozilla.org/en-US/questions/1037353

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