[SOLVED] Viruses through Firefox?

You cannot say taht Firefox is "letting in viruses", but most likely it's text residing in the cache. It is harmless there. Firefox just displays the contents of Web sites, it doesn't run virus programs. And there is no other way to run that stuff when it's in the Firefox cache.
If you empty the cache using the Clear Private Data menu, it will disappear.

Restart you Computer Safe Mode with Networking How To Restart? To get into the Windows Safe Mode with Networking computer is booting press and hold your "F8 Key" which should bring up the "Windows Advanced Options Menu" as shown below. Use your arrow keys to move to Safe Mode with Networking and press your Enter key. Then Download Update and Scan Use Malwarebytes' Anti-Malware Press This Link http://www.download.com/Malwarebytes-Ant…

Download and Scan By using Remove Fake Antivirus description
This application is used to remove fake Antiviruses from your computers press herehttp://www.softpedia.com/get/Antivirus/R…

Download and Scan by Use Super Anti-spyware Press herehttp://www.superantispyware.com/

After Finish Remove Virus/Malware/Trojan Fake Anti-Virus Worm and
Rougue Spyware and
Adware
Restart You Computer To Be Normal Then to Make sure you don't have Virus again

Download and Scan by Use Norman Malware Cleaner Press herehttp://majorgeeks.com/downloadget.php?id…

Don't Forget to said to me Thanks if My Advice will help you.

Run your antivirus to get rid of the infection. The problem is that you did a system restore after that. You could be bringing back the infection if the restore point you chose is infected. It seems that you have made it complicated. I would suggest that you back up your data if you can, reformat and then reinstall your OS and applications.

It wouldn't surprise me at all to find some FF add ons are not what they claim to be, It's sad, its the browser I use because I can add a lot of security to it. But I've also noticed when I run spyware/ malware programs one after the other without clearing up what's been found, the others would also detect it but not always so, malwarebytes finds one thing, spybot something else. You'd think they would all detect the bugs stealing your privacy.