Very frequent and large feature updates, deepening ecosystem integration that uncharacteristically doesn't get the way if you don't use it.
I always get a bit anxious when one of these massive enterprises suddenly gets up and starts moving with newfound focus, and MS is pretty much sprinting on Adderall at this point.
Unfortunately on Mac, I have to run some JS heavy apps and Firefox's performance on those is dismal. Jetstream benchmark for Chrome is 102 vs Firefox at 65.
I really wish more people would look at and help develop NetSurf[0] or other lightweight browsers with their own layout engines More importantly, I wish that regular users would stop going with the 900 pound Chromium/Blink gorilla, and instead use a greater variety of browsers/engines. This browser monoculture is just pure death.