Sounds like a dose of Malware, to me. 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: * [http://www.microsoft.com/security/scanner/default.aspx Microsoft Safety Scanner] * [http://www.malwarebytes.org/products/malwarebytes_free/ MalwareBytes' Anti-Malware] * [http://support.kaspersky.com/faq/?qid=208283363 TDSSKiller - AntiRootkit Utility] * [http://www.surfright.nl/en/hitmanpro/ Hitman Pro] * [http://www.eset.com/us/online-scanner/ ESET Online Scanner] [http://windows.microsoft.com/MSE 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!

Hello, try restarting firefox in safe mode Safe Mode is a special Firefox mode that can be used to troubleshoot and fix problems. Safe Mode temporarily resets some settings and disables add-ons that might be causing problems. see : [[Troubleshoot Firefox issues using Safe Mode]]

Go to the '''''[https://addons.mozilla.org/en-US/firefox/ Mozilla Add-ons Web Page]''''' {web link} (There’s a lot of good stuff here) and search for a good add / pop-up blocker.