Hi, I think its a 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:

• 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 for the info but I used all scanners you gave me links to and they all removed some malware. These 2 keep coming back, doubleclick.net and revsci.net. I'am using microsoft security essentials and it finds nothing. I have dumped my cookies and history also. Do you think I should unistall firefox and reload it a fresh new copy?

Does "Top Arcade Hits" sound like an add-on you installed intentionally??

Disable ALL nonessential or unrecognized add-ons on these two tabs:

orange Firefox button (or Tools menu) > Add-ons > Plugins category
orange Firefox button (or Tools menu) > Add-ons > Extensions category

Usually a link will appear above at least one disabled extension to restart Firefox. You can complete your work on the tab and click one of the links as the last step.

Hopefully that deactivates it and you can eventually just get rid of the ones that you don't need.

Your System Details List shows the TopArcadeHits 1.0 malware and you should remove this extension.

• [/questions/960863] Can't uninstall TopArcadeHits extension

• https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes

thanks to everyone, after disabling realnetworks , chrome bascground, realdownloaded and html5 video shim pepper flash I been running 2 days with no trouble.... thanks again