Avast is using this extension and their products to spy on you, and then sell your browsing information to data brokers around the world.

https://www.forbes.com/sites/thomasbrewster/2019/12/09/are-you-one-of-avasts-400-million-users-this-is-why-it-collects-and-sells-your-web-habits/

https://palant.de/2019/12/03/mozilla-removes-avast-extensions-from-their-add-on-store-what-will-google-do/