That's the big problem. Looking at this only from an average user perspective, it's absolutely right, and "oh yeah well that doesn't work as well as in Chrome because Google pushed an overly complicated unnecessary feature into the standards that requires a company the size of Google to actually maintain and develop it", will only get you blank stares.
I hope I'm wrong, but can't help feeling this war is lost. I can't see how you compete when the rules are being written out by your adversary.
For what it's worth though, Firefox for _me_ is better than the other options in every way; container tabs, easy privacy options, clean interface, etc. I love it.