How can I remove a non-existent/lost device from firefox sync?

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Chapters
00:00 Question
00:34 Accepted answer (Score 7)
01:13 Answer 2 (Score 12)
02:09 Answer 3 (Score 3)
03:27 Answer 4 (Score 1)
04:30 Thank you

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Full question
https://superuser.com/questions/267413/h...

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Tags
#firefox #firefoxsync

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