Mozilla Blog: Is your extension ready for Firefox for Android? Be part of the launch of a new open mobile ecosystem
Kiwi browser hasn't been updated in a long time, I wouldn't recommend it to people anymore, security updates and all that.
In my experience the quality is just fine on duckduckgo.It's a bit different because they aren't tailoring based on all the data google has about you but it's still good.
People have always been saying duckduckgo is bad or worse than google but it's always worked fine for me, and still does.
I played V a lot, great game tbh.