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How to prune unaccessible devices from Sync?


I have had to reinstall my OS a few times, and this has left me with several "phantom" computers, and I don't know how to remove them.

When I go to the "Tabs from other devices" page, I see a bunch of "installations" that I don't have anymore. How do I remove them?

This question seemed like exactly what I needed, but the answer simply didn't work. He said that you can deactivate devices via account.services.mozilla.com, but this is either no longer true, or only works for Mobile installations.

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  • User Agent: Mozilla/5.0 (X11; Linux i686; rv:21.0) Gecko/20130209 Firefox/21.0

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Question owner

The question I referenced was this one: https://support.mozilla.org/en-US/questions/944743

Sorry I forgot to include the link.