Extensions only work with Safari on iOS/iPadOS. To use a content blocker with Firefox, it’s better to use Firefox Focus. DDG browser is fine too. I do still say use Safari with a content blocker like Wipr/Adgurad/Ublock lite etc.

For now ublock lite doesn’t have the feature parity with Adguard.

Wipr 2’s developer is planning to use Apple’s introduction of URL filtering with their OS 26 releases, which will extend Wipr’s blocking to all apps on our device. It acts at the network level, but it can access none of our data. https://kaylees.site/wipr-filtr.html

Pretty sure other content blocker developers will jump on it too.