When firefox launched and kept open, automatically opens multiple sessions for ads and pornography which I have never visited. sessions hide in legitimate ones

Question

I use firefox exclusively. I open many sessions simultaneously mostly one site per session in a single tab. At times during the day when I keep firefox open, I will return to a previous site/session and before I am able to see it, I am getting browser 'pop-ups' of ads for TJ MAxx (a site I never visit) and hard-core porno (a site i never visit and not part of my browsing demographic). These are completely random and hide behind legitimate browsing sessions and are not listed in history etc. They are not being removed by adware or Norton and they are driving me nuts not to mention the embarassment of trying to launch a legitimate site and getting disgusting porno in your face while working with colleagues. Please help!

Answer 1

'''Scan for Malware'''
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://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.
'''Reset Firefox'''
The Reset Firefox feature can fix many issues by restoring Firefox to its factory default state while saving your essential information.
Note: ''This will cause you to lose any Extensions, Open websites, and some Preferences.''
To Reset Firefox do the following:
#Go to Firefox > Help > Troubleshooting Information.
#Click the "Reset Firefox" button.
#Firefox will close and reset. After Firefox is done, it will show a window with the information that is imported. Click Finish.
#Firefox will open with all factory defaults applied.
Further information can be found in the [[Reset Firefox – easily fix most problems]] article.
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