That said, I do appreciate all the work FireFox devs put in to give us a Chrome alternative. Misfires happen. I hope FF for Android keeps getting better with time.
re: addons, a lot of people were understandably upset about this, myself included for a while. With that said, in the months after release every extension which had been disabled by the upgrade started coming back online as the extension API was slowly added back after the rewrite. I can certainly sympathize with the maintenaince headache of trying to maintain one old decrepit piece of software while simultaneously trying to get the one one out the door, since that's exactly what I've spent the last 4 years of my life doing.
Many extensions, including some major ones are still broken on Firefox desktop and I think people are afraid this will happen on mobile as well :-/