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

Internet explorer works but firefox does not! I checked most of the clues, but still the same problem. help!!

  • 2 replies
  • 84 have this problem
  • 7 views
  • Last reply by incinerate

more options

Internet explorer works but firefox does not! I checked most of the clues, but still the same problem. help!!

This happened

Every time Firefox opened

User Agent

Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/4.0; .NET CLR 1.1.4322; .NET CLR 2.0.50727; InfoPath.1; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729)

Internet explorer works but firefox does not! I checked most of the clues, but still the same problem. help!! == This happened == Every time Firefox opened == User Agent == Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/4.0; .NET CLR 1.1.4322; .NET CLR 2.0.50727; InfoPath.1; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729)

All Replies (2)

more options

What exactly is the problem? You are unable to connect to the internet with Firefox?

This can be caused by a firewall blocking internet access to Firefox. See Configure firewalls so that Firefox can access the Internet. That link has a list of popular firewalls and how to configure them to work with Firefox.

Also see Firefox can't load websites but other browsers can

more options

Hi there, im a TSR of one of the ISP. I had a customer having the same issue Internet Explorer that can connect to the internet while Firefox is not. We optimized Firefox, uninstall and reinstall and it's still not working

upon checking the internet of possible causes a lot of people are telling that its because of the firewall or security software maybe, but when we boot the computer in safemode with networking it still not working

so its not the firewall or sec software. ended up reinstalling OS.