It used to be 5 star but ever since this---
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Important:We have ended support of our Avast Online Security & Privacy browser extension for Mozilla Firefox.
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It is now worth 1 star, why would you end support for Avast via firefox? Surely there was a way around this?

The once king of anti-virus has gone, Avast used to be good in the 1990's, it's moves like this that destroy it's reputation and quality.