Very aggressive promoting their premium version. About a few times a day, I get a popup to switch to their premium version. Got tired of it and uninstalled this useless add-on!!

My main issue with AVAST and the way it interacts with Firefox is the "Your browser is being managed by your organization." message.
AVAST is NOT my organization.

I like this add-on, but you should really add an option to add websites on some list that will automatically turn off this add-on. I can't see comments on one site that I am trusting, because of Avast Online Security and it's annoying that I need to turn your add-on by myself just to read comments on that site.

And now I need to add few more things after that update. I hate it. The logo on toolbar is no longer changing what gave me an info if the site I am coming on is safe before. The menu of this add-on is bugged and is not showing up or is hiding behind the elements of the page. It also looks worse. I think that I will look for something else for now.

Firefox has suddenly stopped showing the free safe browsing icons that Avast is meant to show. I've read that this has happened before. yet there appears to be no accessible advise on how to resolve it. Thus I'm left with the add-on's major benefit completely missing and no way to resolve it. This will force me to use an alternative.

have to restart the app all the time

Le passage en mode "secure" pour les sites bancaires fonctionne aléatoirement

Who will police the police? Avast is guilty of the behavior you're using their products to prevent.

Doesn't block sites with phishing, politiaromana for example (neither the AV). Kaspersky free did. Very disappointed.