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

I installed Firefox 18 but it doesnt open or function

  • 1 reply
  • 3 have this problem
  • 4 views
  • Last reply by cor-el

more options

Firefox 18 is installed and it doesn't nor function. I uninstalled it and reinstalled it but no luck. When I try to open firefox 18 a message comes up which says"A copy ofirefox is already open. Only one copy of Firefox can be open at one time." I uninstalled every copy of Firefox But nothing works. I cannot reset fire fox as it does not open.

Firefox 18 is installed and it doesn't nor function. I uninstalled it and reinstalled it but no luck. When I try to open firefox 18 a message comes up which says"A copy ofirefox is already open. Only one copy of Firefox can be open at one time." I uninstalled every copy of Firefox But nothing works. I cannot reset fire fox as it does not open.

All Replies (1)

more options