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Why does firefox delete all my usernames and passwords each and every time it updates?

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every time firefox updates, it deletes all usernames and passwords as well as all bookmarks.

every time firefox updates, it deletes all usernames and passwords as well as all bookmarks.

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Is there a new profile created?

You can check if you have an "Old Firefox Data" folder on the desktop in case the Refresh feature in Firefox has been used and a new profile has been created.