Avast Free Antivirus
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Full user review
This plugin is HORRIBLE HORRIBLE HORRIBLE! The minute I installed it I was bombarded with popups. It completely messed up my Thunderbird email. Made it so slow I can't stand it. THE PEOPLE WHO PUT THIS ON THE MARKET SHOULD BE ASHAMED OF THEMSELVES! If it has ANY antivirus value whatsoever its not worth the headache of all the rest of the crap it does.