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My Passwords are unwanted on another computer
A customer shared his Firefox login with me to share his passwords. I logged in with his account, downloaded his passwords and logged out directly afterwards, but now he is reporting that he has ALL my passwords. How can undo this? I never gave him access to my account and I never clicked on sync or something?
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When you log in to a Firefox Account for Sync then your data is uploaded to that account on the Sync server, so what you experienced by connecting to the customer account to sync his logins is expected behavior and you should never do this. To do this safely, you should have used a separate Firefox profile and connect that profile to Sync and export the logins to CSV and import those logins or ask the customer to export his logins to CSV send you that file and import this CSV file in your current profile.
You need to enable import CSV in the Password Manager (about:logins) via the about:config page as this menu item is currently hidden for performance reasons.
- about:config => signon.management.page.fileImport.enabled = true
WARNING: Changing preferences through this interface not officially supported Hidden settings edited using the about:config tool are explicitly not supported, which means that Mozilla makes no guarantees they will be supported in the future, or that Mozilla will fix them if they break. Mozilla does not test these preferences, and will not in the future. That includes security and performance testing which these preferences may affect.
[Warning added by moderator]
Modified by Chris Ilias