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I've been on Firefox since I can remember it being out, but the latest versions, 56+, have me using it only intermittently due to battery drain issues on Mac[0] :(. I am really hoping they get this fixed shortly. [0] https://bugzilla.mozilla.org/show_bug.cgi?id=1404042
Honestly, if you are on macOS, just use Safari. Most extension you want/need are there (or the are suitable replacements. cVim and sVim are pretty close if you don't dive to deep, for example). Adblocking is actually faster than on any other browser because the blockers use the same Content Blocking API as on iOS Safari. And then the battery life... you easily get 2-4h more just by using Safari. Which brings me to my…
I don't have a laptop, but will when the Qualcomm Snapdragon Windows10 machines land, and will probably use Edge exclusively there.
It's important to watch where incentives run. Google has the incentive to profit from you. Microsoft and Apple have the incentive to make sure your browser and device work as efficiently and well together as possible. Mozilla focuses on privacy as their main feature.