For Windows, I prefer portable first, I don't want some auto running background services from Google/Mozilla. So I chosen IronPortable & Firefox Development Por

For Windows, I prefer portable first, I don't want some auto running background services from Google/Mozilla. So I chosen IronPortable & Firefox Development Portable. For Linux, I sticked with default Firefox from OS repository. For mobile, I highly recommend Kiwi Browser - the one of very few Chromium base which let you install Chrome extension like Ublock.