Most of the comments here are about using or not using Firefox, depending on it's features as compared to primarily Chrome. However, for me, it is not about being better or having more features at all - it is because I like Firefox and want to support Mozilla and believe that Google should not control the web. It is somewhat similar to the free software vs. open source debate - one should use free software not becaus…
People have different workflows and different priorities in that department, the best thing a browser could do to try and gain market share is keep their mind open to these differences and try and enable all of them. Something most browsers fail at to one degree or another.
For example, I loved firefoxes two address bar approach over chrome's omnibar. I would set the default search on the address bar to route to google's browse by name (it auto selects showing a search results page or going to the first result (i'm feeling lucky) based on how confident it was that the first result was what the user wanted) and the default search on the search bar to google. If I wanted to go somewhere by name I'd type in the address bar, if I wanted to search for something and be sure i got a results page I could just type it in the search bar.
I've used chrome for my daily driver despite loving firefox for one simple reason, and that's the Google Voice extension. It has a little number in the icon next to the address bar, that tells me how many unread voicemails or text messages or missed calls I have on my cell phone, its always visible in the window I have active on at least 1 monitor 99% of the time, and it's the primary way I keep track of incoming text messages as well as missed calls.
I would be lost without this so despite firefox having a lot of features I prefer over chrome, chrome is still my daily driver because of one extension that firefox doesn't have last time I checked.