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How to set which extensions are allowed to sync?

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I am using 3 browsers on 3 different PCs, usually synchronised by FF Sync. I made a review and decided to delete few useless extensions. So I disconnected all browsers from the FF Sync service, manually deleted all useless extensions in all 3 browsers, then signed in again, and the deleted extensions are back. That's not my desired result...What shall I do?

I am using 3 browsers on 3 different PCs, usually synchronised by FF Sync. I made a review and decided to delete few useless extensions. So I disconnected all browsers from the FF Sync service, manually deleted all useless extensions in all 3 browsers, then signed in again, and the deleted extensions are back. That's not my desired result...What shall I do?

Chosen solution

Did you try to remove the extensions while you are logged on to Sync to make sure that the data stored on the Sync server is updated.

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Did you try to remove the extensions while you are logged on to Sync to make sure that the data stored on the Sync server is updated.

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I did it on 2 PCs simultaneously, and it seems working...Thank you.