also don't use brave or vanilla Firefox

https://lemmy.blahaj.zone/post/40391590

Blåhaj Lemmy - Choose Your Interface

Absolutely do not use Brave. Just use Firefox mobile as well, it has ublock origin, sponsorblock, and background play.
Another good option for iOS is YTLite
GitHub - dayanch96/YTLite: A flexible enhancer for YouTube on iOS

A flexible enhancer for YouTube on iOS. Contribute to dayanch96/YTLite development by creating an account on GitHub.

GitHub
When did iOS get ublock origin and sponsorblock as extensions for FF?
I don’t believe it did.
Yes, because “Firefox” on iOS is just Safari with a Firefox skin
Orion Browser supports extensions and seems okay.