[bad_user]

Extensions like 1Password work in Firefox and Chrome but not content blockers. I know because I tested both.

Mozilla also made a statement about it: https://motherboard.vice.com/read/heres-why-firefox-for-ios-...

[st3fan]

1Password only works in non-Safari browsers if those apps include a less optimal SDK that provides a generic password filling conduit.

It is not something that WKWebView automagically does.

See https://github.com/AgileBits/onepassword-app-extension