Bitwarden added Fenix, RB, and Rocket to its autofill whitelist on 2019-03-29, but the most recent Bitwarden release is version 1.22.0 from 2019-02-04. https://github.com/bitwarden/mobile/commit/6088cfe2669d692d60175388aaf59933e07c9be8#diff-743a249a3bb6eca734660644492de094
Bug 1538385 Comment 9 Edit History
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Bitwarden added Fenix, RB, and Rocket to its autofill whitelist on 2019-03-29: https://github.com/bitwarden/mobile/commit/6088cfe2669d692d60175388aaf59933e07c9be8#diff-743a249a3bb6eca734660644492de094 But the most recent Bitwarden release is version 1.22.0 from 2019-02-04. We should retest this bug after Bitwarden releases a new version: https://github.com/bitwarden/mobile/releases