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Hello dear admin I lost all of my bookmarks and try many ways to recover them as example , uninstall and install firefox or restore from previous backup , or import from file , or import from another browser like edge ,.... but didnt work even I cant add any new bookmark in my toolbar or bookmarks menu I read and did all of internet guid in mozilla forum but cant back them up . thank you.

Hello dear admin I lost all of my bookmarks and try many ways to recover them as example , uninstall and install firefox or restore from previous backup , or import from file , or import from another browser like edge ,.... but didnt work even I cant add any new bookmark in my toolbar or bookmarks menu I read and did all of internet guid in mozilla forum but cant back them up . thank you.

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This part can indicate a problem with the Places database that stores your bookmarks and history:

ja.jahanbani said

... I cant add any new bookmark in my toolbar or bookmarks menu ...

Hopefully you already tried doing a regular shutdown and restart of Windows to clear up any file locks that might be preventing changes. If not, please try that next.

Did you already find this article: Fix "The bookmarks and history system will not be functional" error message?