i use "firefox focus" on mobile. i like it because using it is like using a kiosk -- after you're done, it deletes everything and starts fresh. also it's choc-full of content blockers. it's good for privacy and, more importantly for me, it encourages me to just use my phone for looking up information rather than casual time-wasting browsing.

it also doesn't support multiple tabs, though (at least on iOS, i don't know about android). i've gotten used to it, and it helps to enforce my phone-as-a-tool mentality, but i can see how that could be a deal-breaker for most people.