Tap here to go to the mobile version of the site.
Your Firefox is out of date and may contain a security risk! Upgrade Firefox

Support Forum

I can't open Firefox, it just doesn't come up the screen


I have reinstalled Firefox lots of times and found every site to help but i still can't open firefox. May someone help me?

I installed google chrome

User Agent

Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.0; SLCC1; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30618)

Additional System Details


  • User Agent: Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.0; SLCC1; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30618)

More Information

  • Top 10 Contributor
  • Moderator
10750 solutions 96735 answers

A possible cause is security software (firewall) that blocks or restricts Firefox without informing you about that, maybe after detecting changes (update) to the Firefox program. Remove all rules for Firefox from the permissions list in the firewall and let your firewall ask again for permission to get full unrestricted access to internet for Firefox. See Configure firewalls so that Firefox can access the Internet and http://kb.mozillazine.org/Firewalls

See also http://kb.mozillazine.org/Browser_will_not_start_up

Question owner

I tried your way but it still doesn't work. Does installing google chrome make this happen? I installed Chrome and then I can't open Firefox.

David W(satdav) 3 solutions 36 answers

can you try and open firefox in safe mode

has your firefox crashed

please see this info to get a crash report in case it has

crash report info

Question owner

well I uninstalled it couple of times and I can't even use Safe mode. The Firefox just doesn't start!!!!!!!!!!!!!!!!

David W(satdav) 3 solutions 36 answers

OK thanks for that information what os are you using and what version

os = operating system

Question owner

Well I am using Windows Vista Business. I can use FF before but suddenly it just doesn't work.