My profile may have been reset to default, not by me.
I exited Firefox and restarted my Windows 10 computer. Upon attempting to launch Firefox, I was presented with the profile manager. It did not list any profiles from which to choose. In Windows Explorer, I found that my profile did exist. And there is a profiles.json file in the Profiles folder, but it is empty. I attempted to copy my good profile data into a new profile folder (that I created using profile manager) but upon launching, everything was set to default.
So, to sum up, cannot seem to use my profile, but it does seem to exist.
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Look on your desktop. Do you see a folder called; Old Firefox? Look inside. Look for the folder with the latest creation date.
https://support.mozilla.org/en-US/kb/recovering-important-data-from-an-old-profile
https://support.mozilla.org/en-US/kb/back-and-restore-information-firefox-profiles
https://support.mozilla.org/en-US/kb/how-run-firefox-when-profile-missing-inaccessible
https://support.mozilla.org/en-US/kb/how-run-firefox-when-profile-missing-inaccessible
http://kb.mozillazine.org/Profile_folder_-_Firefox#Navigating_to_the_profile_folder
https://support.mozilla.org/en-US/kb/profile-manager-create-and-remove-firefox-profiles
https://support.mozilla.org/en-US/kb/back-and-restore-information-firefox-profiles
Type about:profiles<enter> in the address bar.
How many profiles are listed?
How many should be there?
Also, open the profile folder in your file explorer.
由 FredMcD 於 修改
There is no profile folder on my desktop. I tried "Recovering important data from an old profile" with no luck. "How to run Firefox when profile missing/inaccessible" did not help. When this problem first appeared, profile manager appeared when I attempted to launch. There were no profiles listed, so I could not even choose one. The profiles folder was in its proper location however. And it contains my good profile, that I want to use.
I created a new profile and browsed to my good profile to launch with it. Upon doing so, it was set to default--no history or bookmarks, etc. I created another new profile and manually copied all of my good profile data into it (yes, while Firefox was not running). Same problem.
When I type about:profiles, all I see are the two new ones I created.