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uBlock too. Or maybe it would be possible to use the upcoming iOS 9 content-blocking extensions [1], or is it a feature/api usable to Safari only?

[1] https://developer.apple.com/library/prerelease/ios/releaseno...

The newer web view (WKWebView) will support content blocking extensions across all apps. The older web view (UIWebView) will not support content blocking at all

Presumably any add-on supported by Firefox on Android.

erm.. ublock :)

Lastpass, Privacy Badger, Disconnect and uBlock