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Hi, Since yesterday, after changing my passwort for firefox account my bookmarks are totally changed into very old ones. Where from got Firefox these old bookmarks (2 or more years old) and how can I get back my actual list of bookmarks?

Hi, Since yesterday, after changing my passwort for firefox account my bookmarks are totally changed into very old ones. Where from got Firefox these old bookmarks (2 or more years old) and how can I get back my actual list of bookmarks?

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That's strange.
Any problem with your other devices that are on that same Sync account?
Like data lost on other devices or data duplicated on the other devices?

Supposedly (and my experience with Sync) there is only one copy of data retained on the Sync server for each Firefox Account. That data gets merged with existing data as the data is uploaded and as the data set is changed across the devices which are connected.

Are you connected to Sync all the time?
Or do you enable it (connect to Sync) at will?

That said, each Firefox installation does automatic backups of Bookmarks, and saves 15 copies before thet are overwritten with newer backups. See this support article for more information:
https://support.mozilla.org/en-US/kb/restore-bookmarks-from-backup-or-move-them#w_restoring-from-backups

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That's strange.
Any problem with your other devices that are on that same Sync account?
Like data lost on other devices or data duplicated on the other devices?

Supposedly (and my experience with Sync) there is only one copy of data retained on the Sync server for each Firefox Account. That data gets merged with existing data as the data is uploaded and as the data set is changed across the devices which are connected.

Are you connected to Sync all the time?
Or do you enable it (connect to Sync) at will?

That said, each Firefox installation does automatic backups of Bookmarks, and saves 15 copies before thet are overwritten with newer backups. See this support article for more information:
https://support.mozilla.org/en-US/kb/restore-bookmarks-from-backup-or-move-them#w_restoring-from-backups

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As mentioned to me by McCoy (another long time support contributor here), perhaps the Bookmark Manager and Viewer 0.2.6.1 Add-on / extension might be the culprit.