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This profile was last used with a newer version of this application. Please create a new profile.

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mikael.boldt
mikael.boldt

Mozilla made an update of my Firefox installation on my Win11 laptop. all my password disappeared as well as my history and bookmarks.

I have now a virgin installation and is starting from scratch.

Now I get this error message: "This profile was last used with a newer version of this application. Please create a new profile." I deleted met shortcut and I opened Firefox by using Windows search. Now I see 4 profiles! I think I do not need to create a new profile. Maybe delete 3 of them ? What to do ? And, how?

Mozilla made an update of my Firefox installation on my Win11 laptop. all my password disappeared as well as my history and bookmarks. I have now a virgin installation and is starting from scratch. Now I get this error message: "This profile was last used with a newer version of this application. Please create a new profile." I deleted met shortcut and I opened Firefox by using Windows search. Now I see 4 profiles! I think I do not need to create a new profile. Maybe delete 3 of them ? What to do ? And, how?

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TechHorse
TechHorse

mikael.boldt, I wouldn't delete any profiles as one of them may contain the missing bookmarks and passwords etc.

To try and see if one of them does, follow this guide: https://support.mozilla.org/en-US/kb/recover-user-data-missing-after-firefox-update

If you can't launch Firefox because of the 'used with a newer version' message then you can either create a new profile as suggested, or you can bypass Firefox's downgrade protection and force it to open with a profile from a newer version with the "-allow-downgrade" command line argument.

See here for more information on using Firefox with a command line argument, but note the caution under the "-allow-downgrade" heading: https://wiki.mozilla.org/Firefox/CommandLineOptions

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