What other stuff exactly are you hoping they are working on? I've been using Firefox since the beginning. I've never, at any point, felt like I was missing out on anything. And using it right now, there's nothing I need to do that I cannot.

Considering there are many people that want a browser that has a low profile and gets out of the way, what would Firefox need to do to fulfill those people's needs other than to just leave well enough alone?