avast deactivated in firefox

After running avast (free) on my mac for a while i got a notification that says:

Avast online security can not be verified to be used in firefox and has been inactivated (in the setup meny for addons)

Is the computer still protected? I like when I see the green ok-mark in the search engine. It seem that I am missing a signature or something I am a little bit hopeless with computers :frowning:

https://forum.avast.com/index.php?board=5.0

https://developer.mozilla.org/en-US/Add-ons/Distribution