@jon@vivaldi.net to say that mozilla drove firefox into the ground is an understatement, but right now gecko/firefox (and derivatives) is the only engine/browser that is a viable alternative to blink/chromium monopoly.
in its current state, webkit doesn't stand a chance. plus, i can't live without firefox container tabs and ublock origin.

TL;DR: all browsers suck and i have no favorite, but firefox sucks the least and it is my browser of choice for most things.