Personal Take: Completely agree. I am opening up Firefox with Panarama Mode missing, Pocket, Hello.
And BTW, e10s hasn't shipped yet, and at the current timeline, even if it ship in Firefox 49/50 it will still not be any good for power / heavy tab users, which incidentaly is the only group left using Firefox, most have moved on to Chrome.
I see light of hope in Servo. But liscenses ( MPL? Why not Apache 2.0 ) are a concern for a few company to join and devote resources into it. ( Apart from Samsung )