Where did you install Firefox from? Help Mozilla uncover 3rd party websites that offer problematic Firefox installation by taking part in our campaign. There will be swag, and you'll be featured in our blog if you manage to report at least 10 valid reports!

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

My Firefox updated over night and deleted my entire profile

  • 2 replies
  • 1 has this problem
  • 2 views
  • Last reply by cor-el

more options

All of my search history, passwords, bookmarks, everything is gone. I searched %appdata% and found my two old folders (one ends in .default other in .user). I went to profiles and changed them to default and nothing changed. It just puts me in default homepage and asks me to make a new profile. Please help, there is extremely important stuff that I've just lost for no reason.

All of my search history, passwords, bookmarks, everything is gone. I searched %appdata% and found my two old folders (one ends in .default other in .user). I went to profiles and changed them to default and nothing changed. It just puts me in default homepage and asks me to make a new profile. Please help, there is extremely important stuff that I've just lost for no reason.

All Replies (2)

more options

If Firefox won't let you launch a profile from about:profiles and instead says you need to create a new one, it usually means that profile has been marked as having been upconverted to a newer version than the one you are trying to launch it in. Which doesn't make a lot of sense because your Firefox identified itself as the newest version.

Have you recently run a beta or other pre-release version of Firefox on your system?

If not, we might need to suggest a little file surgery to make Firefox forget the last version of the browser that used that profile. I may need to search some other threads for the steps to do that as I wouldn't want to suggest deleting the wrong things.

more options