This comment is pushing me over to try firefox as my primary browser. I'd love to see Firefox stay slick like Chrome. It's the development curve of Chrome that has kept me attached to it. Some useful features like managed search engines with shortcut are really neat in Chrome. I'm sure Firefox has them too. Sooner than later I plan on switching to Firefox.
I'm not sure if this is what you're looking for, but Firefox keyword searches let you bookmark any website's search page and then invoke it from the address bar with a keyword:
If Firefox hasn't had this since its inception, it's at least been available for the vast majority of its lifespan. Don't remember a time when I haven't used this feature (and I've been using Firefox for a longggg time). Really interesting to see someone mention a feature in Chrome as a benefit over Firefox when Firefox had it first.
I hope more people switch (back), and in turn, more people contribute.
I was almost sure Firefox had it. It's just that I switched to chrome a few years back because it was way lighter than Firefox 'at that time'. However, right now it's just inertia that's keeping me with Chrome. Still waiting for a killer feature that'll make Firefox a must have.