Firefox focus is a broswer AND an ad blocker for Safari
Just try Safari (with JS left enabled) now that you have Firefox focus on - making sure the preference to use installed ad blockers is enabled (in the Settings app...sorry!)
It doesn't eliminate all ads, but the really bad ones that slow things down, flicker, drag you to other pages etc. are gone. There may be other iOS ad blockers that do a more complete job, but I'm happy with the outcome.
Biting the hand that feeds IT
