hello Chindi, when you have it present, could you go to firefox > help > troubleshooting information, copy its exact name, version and id from the listing there and paste it here into a forum reply - this could make it possible for mozilla to take further action on it...

afterwards please run a full scan of your system with different security tools like the free version of malwarebytes & adwcleaner.

Troubleshoot Firefox issues caused by malware

Here are the details on my Firefox installation pasted here: Name Firefox Version 27.0.1 Update History User Agent Mozilla/5.0 (Windows NT 5.1; rv:27.0) Gecko/20100101 Firefox/27.0 Profile Folder Enabled Plugins about:plugins Build Configuration about:buildconfig Memory Use about:memory

Sometimes a problem with Firefox may be a result of malware installed on your computer, that you may not be aware of.

You can try these free programs to scan for malware, which work with your existing antivirus software:

• Microsoft Safety Scanner
• MalwareBytes' Anti-Malware
• TDSSKiller - AntiRootkit Utility
• Hitman Pro
• ESET Online Scanner

Microsoft Security Essentials is a good permanent antivirus for Windows 7/Vista/XP if you don't already have one.

Further information can be found in the Troubleshoot Firefox issues caused by malware article.

Did this fix your problems? Please report back to us!

Thanks to Philipp and Moses. Problem has been resolved using MalwareBytes.