Switched to Firefox Quantum when it came out, and never looked back. Never had a problem with any website I used on any of my machines (which include the i7 16GB RAM work laptop, Core2Duo 3GB home desktop, and wife's old Thinkpad still running XP). Everything runs faster than Chrome, especially on the older machines, and I can comfortably open more tabs.
Granted, my top 4 sites are probably HN, Reddit, Facebook and Youtube, and the first two aren't very demanding of the browser - but the links from these sites go all over the place, and I simply never had to launch another browser ever since.
I find Firefox more feature-rich, and use the Reader View very often (especially at work, where visual clutter is the last thing I need on my monitors). MRU tab switching order out of the box is also great to have.
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