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I sometimes receive notification that Fx can't update automatically and I need to download the update. Twice now, the update has deleted my profile on drive D, and replacing it with a new one on the default C: drive. Settings, options, addons all GONE! I finally had to restore my entire system from a backup. What's going on and how can I prevent it happening again?

Suddenly! Cannot open Firefox because of the error message: "Firefox profile missing or unavailable."

I found the profile in my Library.

Looked for internet advertised "Firefox profile manager," but could not find it. Only one I could find was obsolete.

Thank you.