Hello Pickles729, in your system details it seems you have some malicious extensions, 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/viruses/disinfection/5350 Anti-Rootkit Utility - TDSSKiller] * [http://general-changelog-team.fr/en/downloads/viewdownload/20-outils-de-xplode/2-adwcleaner AdwCleaner] (for more info, see this [http://www.bleepingcomputer.com/download/adwcleaner/ alternate AdwCleaner download page]) * [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. -------------------------------------------------------------------------------------------------- also, check for malicious programs in your pc : Open Programs and Features by clicking the Start button, click Control Panel, click Programs, and then click Programs and Features, then click Uninstall for any unknown program you have. -------------------------------------------------------------------------------------------------- finally, delete in your [http://kb.mozillazine.org/Profile_folder_-_Firefox#Windows profile folder] the [http://kb.mozillazine.org/User.js_file User.js] file you have ? The user.js file '''does not exist by default'''. If you create the file, forget it, if you have not create the file then''' delete the User.js file''', to see if the problem goes away (some programs create and write in the file also). thank you

Some added toolbar and anti-virus add-ons are known to cause Firefox issues. '''Disable All of them.'''