After restarting my Laptop Firefox forgot althoug it's synced all groups and tabs. There is no error message concerning the sync behaviour.

It seems, that the sync server forgot all my tabs and groups, as Firefox dooesn't report any error. Any ideas?

Remove the SYNC and reconnect it.
Check the SYNC log
*about:sync-log

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After restarting my Laptop Firefox forgot althoug it's synced all groups and tabs. There is no error message concerning the sync behaviour.

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