Click the Firefox button, go to Add-ons, then Plugins and disable "'''My Web Search'''". This is adware which runs in the background and spends its time trawling the web searching for ads to feed you. Also, something shows in your system details with the number '''2,5,3,1 '''. Can you tell me what that is please? It's located in the same Plugins menu. Similarly, I see three versions of Veetle. Disable the older ones if you don't need them. On the security side, your Flash player is out of date and exposes your system to exploits. See: http://www.adobe.com/support/security/bulletins/apsb11-12.html (Update link near the foot of the page). If the problem persists, try running Firefox in [[Safe Mode]]. If it functions properly in that configuration, then one of your add-ons is the culprit.