Depending on what password manager you use, you can try getting the Firefox extension for it. I use Bitwarden, and their extension just works. Although I agree

Depending on what password manager you use, you can try getting the Firefox extension for it. I use Bitwarden, and their extension just works. Although I agree with you that they should have support for it through the accessibility/auto-completion services. The ability to have uBlock in a mobile browser is too convenient to give up.