I used to use Firefox before chrome released. It used to be the best, but chrome took the crown after Firefox became a memory eater.
Now chrome is being all iTunes walled garden, and Firefox also recently overtook it in terms of speed.
I installed it alongside my trusty chrome install, played around with extensions(or add-ons) until the experience mostly matched, and switched over once I was satisfied.
Chrome’s still installed if I need it, but I haven’t needed it!