Well that marks one more end of an era. With Camino folding up and Opera going with WebKit - Camino too was on the way to this with Gecko being out of the question - the browser field is getting to be a one-horse race (since all the cool kids are going with Chrome these days).
Arguable. Jolla uses Gecko with IPC embedding for their upcoming browser for Sailfish. Gecko is in no way out of the question. Mozilla are also working on the new Rust based browser engine (Servo).
