content: For both security and privacy, Firefox is likely your best option. But with some adjustments most of the open source browsers in the list can be made to be both secure & privacy respecting. Beware that WebRTC is not privacy friendly so it should be disabled unless you need it. For Andrdroid, I would suggest either Firefox or Brave. I personally use Brave primarily because Firefox seems sluggish. However, Firefox is the only Android browser I know of that allows extensions. I don't know about iOS.