One tab has disappeared from the toolbar and the pinned page of one tab pages is also gone.
It still shows in the add ons and shows delete and remove buttons. But there is no way to actually use use it. And all my saved pages are gone. I tried to delete it and download it again, but it didn't delete. I tried downloading again even though it showed as being there already, but that didn't help either. How do I get One Tab to work again?
Alla svar (2)
I think you may need to contact the author directly. See: https://www.one-tab.com/feedback
In case it suddenly crosses your mind to use Windows' "System Restore" feature to roll back the Firefox update or any other update -- PLEASE wait until you have made a backup of your Firefox profile folder because system restore occasionally causes serious data loss.
Thank you.