

When you enabled Avast Online Security extension in Firefox, it will request information about your visited websites from an Avast server. So how does these AVG / Avast extensions misused your browser data? Here's a short explanation on this matter.

So for existing users these extensions will still be active and continue spying on the users. Mozilla didn’t blacklist the extensions however, stating that they are still talking to Avast. Mozilla immediately disabled the extension listings, so that these extensions can no longer be found on the Mozilla Add-ons site. So yesterday I reported these four extensions to Mozilla and Google.

Spying on your users is clearly a violation of the terms that both Google and Mozilla make extension developers sign.
