Join the AMA (Ask Me Anything) with the Firefox leadership team to celebrate Firefox 20th anniversary and discuss Firefox’s future on Mozilla Connect. Mark your calendar on Thursday, November 14, 18:00 - 20:00 UTC!

This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

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 get a fatal error message, "could not find %APPDATA%\. " when I try to open Firefox under another user . It is fine under the first user. How can I fix this.

more options

Version is 7.0.1 Windows 7 64 Bit I can open FF under my user name which is not an Administrator, but when I try to open it under one of the Administrator names I get that error message. I do have the password for that administrator.

Version is 7.0.1 Windows 7 64 Bit I can open FF under my user name which is not an Administrator, but when I try to open it under one of the Administrator names I get that error message. I do have the password for that administrator.

All Replies (1)

more options

Upgrade your browser to Fiefox 8 and check