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websites pop up when not asked

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hi there when i type in an address of a website it will work fine but after a few seconds it will change to this website "http://www.questscan.com/?tmp=404tmp&prt=QstscanPB&keywords=http://www.fusionelectronics.com/favicon.ico" with out me touching anything. please can you tell me how to get rid of it cause its really anoying.

regards ri ch

hi there when i type in an address of a website it will work fine but after a few seconds it will change to this website "http://www.questscan.com/?tmp=404tmp&prt=QstscanPB&keywords=http://www.fusionelectronics.com/favicon.ico" with out me touching anything. please can you tell me how to get rid of it cause its really anoying. regards ri ch

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This issue is caused by the QuestScan extension (Tools > Add-ons > Extensions).

Start Firefox in Diagnose Firefox issues using Troubleshoot Mode to check if one of the extensions is causing the problem (switch to the DEFAULT theme: Firefox (Tools) > Add-ons > Appearance/Themes).