> finally broke down and installed FB messenger again,
Prob not great for more advanced messenger functionality but Face Slim (https://github.com/indywidualny/FaceSlim) does notifications and simple/group chats fairly well.
What sucks is I was perfectly happy with fb web, until they started cutting features in mobile (can't post to a friend's wall, can't do a lot of things now). The biggest issue is FB the app didn't respect the environment/usability settings for extra large fonts.