With every Firefox update, some users seem to end up restarting with a brand new profile. I don't know what triggers the installer to reject the existing profile and make a new one but it manifests as near-irrecoverable data loss on the part of the user.
Ooops, hit submit before putting in links: https://support.mozilla.com/en-US/questions/864596 mentions a crash and definitely got a new profile The following people only talk about bookmarks but from experience, they often have lost other things: https://support.mozilla.com/en-US/questions/867183 https://support.mozilla.com/en-US/questions/868325 https://support.mozilla.com/en-US/questions/869584 There are lots of other reports where only one file or another in the profile was broken. That's probably a different bug.
Severity: normal → critical
Component: General → Startup and Profile System
Product: Firefox → Toolkit
Given that this report is 6 years old, the reporter's account has been disabled, and it was filed on behalf of a bunch of sumo threads (that must also be >= 6 years old), I don't think we can do anything here.
Status: NEW → RESOLVED
Last Resolved: a year ago
Resolution: --- → INCOMPLETE
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