[st3fan]

Not sure why this is downvoted because gcp is correct.

Apple has decided that Content Blocking is a Safari only feature. Apple has made the decision to not expose the private APIs in WKWebView that would allow browsers like Chrome and Firefox to use the same speedy content blocking.

The old WebView, UIWebView, also does not support content blocking. But since it runs completely in the same process as your app, you can replace the HTTP handling with your own and patch content blocking on top of that.

That is what Firefox Focus and Brave do for example. It works, but it is far from ideal. Also, it is likely an API on the way to be deprecated.