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Unfortunately Firefox on iOS doesn't have access to content blockers and can't install its own ad-blockers.

Install Firefox Focus. You can set it as a content blocker for Safari!

Iphone user here. I actually don't bother installing FF on my Iphone because Safari isn't bad at all.

Thanks for the Dark Reader suggestion, I was looking for exactly that on mobile.

yes this. uBlock on Android mobile has become my main reason not to buy any new iOS devices.