I'm (loosely) affiliated with Mozilla and I can guarantee you everything I heard from inside is about poor reception.

Hell, I use one-tab on Chrome, but pocket is just a usability disaster. If I can barely bring myself to use it, imagine the rest :/

I wouldn't be so sure about that. There may be a relatively small number of very vocal individuals, but I think their opinions may be much more widely held that you believe they are. It's no secret that Firefox's share of the market has been dropping lately. For every individual who speaks out against the latest set of bad decisions from Mozilla, there are clearly many other users who share that disappointment, but say nothing, and instead just move from Firefox to some other browser. It's these silent former users who contribute to Firefox's decline in market share each month.