You have to understand that there's making a stand on what's right, and then choosing to focus on the rest of your life... which, in this case, means not being annoyed by a browser that isn't keeping up. Firefox is great, many of us have loved it since Firefox 2 (or even before!) but you don't get significant increases in users by being the "more greater good" option. You get them by keeping up in the race. A browser is a tool and I want it to feel like it belongs, let me move, and then get the hell out of my way.
Every single time I use FF on Mac there is something weird or buggy about it, and this holds true even if I install it on a freshly bought unpolluted MacBook Pro. The UI stands out like a sore thumb, and it doesn't feel like it belongs.
I'll continue using Safari.