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Re:Open-sourcing Chrome on iOS by bad_user on Tuesday January 31, 2017 @02:41PM (#13534437)
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-...

Re:Open-sourcing Chrome on iOS by st3fan on Tuesday January 31, 2017 @03:44PM (#13535020)
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