I am facing the same problem, the browser integration is gone - once again - very nasty.
at least the login through the easyPass editor still works, but it is definetely not a smart way of working - having ones users again and again to search for solutions themselves!
This is not a freebie shareware, so some proactive communication may be well expected! Firefox updates don't fall from sky, so please start to think proactive - rather than running behind when the problem occurs! I hope, this is read by someone inside avast... even so I don't believe that there will be any consequences taken, please note that I am not a happy customer any more.
Thanks