The malicious behaviour of Avast and AVG extensions was discovered almost a month ago by Wladimir Palant, who detailed how the extensions are sending a large amount of data about users' browsing habits, listed below, to the company's servers - 'far beyond what's necessary for the extension to function.' Most of you might not even remember downloading and installing these extensions on your web browser, and that's likely because when users install Avast or AVG antivirus on their PCs, the software automatically installs their respective add-ons on the users' browsers.īoth online security extensions have been designed to warn users when they visit a malicious or phishing website whereas, SafePrice extensions help online shoppers learn about best offers, price comparisons, travel deals, and discount coupons from various sites.