Ask HN: What browsers are devs at top web companies using?

I'm guessing Google employees, as a population, strongly tend to use Google Chrome as their primary browser.

Out of curiousity, if you do development work at a company whose product has a strong web presence, eg. Facebook, Twitter, AirBnB, etc. (not Uber, Snapchat, etc.), what browser do you and your colleagues primarily use?

Cheers.