Orion on iOS blocks ads. It's made by Kagi. Not sure how they got away with it, and it's not firefox, but it's as close as you can get right now.

FYI as an alternative, if you are stuck with Safari on iOS, you can try AdGuard with Vinegar and Baking Soda apps.

You can on Android, why do you need the iPhone?

Not OP, but as someone who hates ads and values privacy, switching to a phone built by the world's largest data broker / advertising agency seems like a bit of wrong turn.

iOS has many - many! - issues, but it is a more privacy-respecting platform than Android is. I'm not saying this to knock Android; I would dearly love it if Google weren't such a data hoover. I'd switch over and never look back.

Why would Android be inherently less privacy-respecting? Just use it without a Google account or use GrapheneOS. Will be more secure than iOS, too.

How about a Pixel with GrapheneOS then? Or even a Linux phone if you can live without some apps? There are options and compromises.

I thought about it but it’s not really an option if you need certain apps / push notifications. If the options are Android without google play services vs iPhone, the realistic option is iPhone.

GrapheneOS has a neat feature called profiles, so you can have a profile with play services when needed but your main one can be de-googled. Push notifications and apps are cancer anyways, try to live without them.

You're not wrong, but try and tell my bank they should release banking apps for those systems.