Windows 10 reached EOS (end of support) on October 14, 2025. If you are on Windows 10, see this article.

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

I recently got on your beta channel somehow for firefox for releases and now have a problem

i now keep getting a pop up window saying that this profile was last used with a newer version of this application. Please create q new profile. what am I to do?

i now keep getting a pop up window saying that this profile was last used with a newer version of this application. Please create q new profile. what am I to do?

Modified by cor-el

All Replies (1)

There is a section of the following article about starting Firefox from a command line (you can use the Run dialog -- Windows key + R) in a manner that allows using an upgraded profile in an older version of Firefox. This isn't guaranteed to work if there were data file format changes in the beta version. But I think it's worth a try.

See: Dedicated profiles per Firefox installation -- the "What happens to my profile if I downgrade to a previous version of Firefox?" section