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

After I close Firefox 4.0 and try to open it later, it says that another instance of firefox is already open and won't let me open firefox. I have to restart computer..

more options

After it closes I work on another program, etc. When I try to go online again firefox says it's still open even though I can see nothing. Going to Task Manager doesn't show anything open. I'm running Windows 7 64-bit.

After it closes I work on another program, etc. When I try to go online again firefox says it's still open even though I can see nothing. Going to Task Manager doesn't show anything open. I'm running Windows 7 64-bit.

All Replies (1)

more options