Autofill is broken for me on a new Big Sur M1 iMac on Firefox and Chrome (latest of both)

Big Sur 11.5.2 (no updates available). Firefox 91.0 (64-bit) Chrome Version 92.0.4515.131 (Official Build) (arm64) Firefox 1Password extension (desktop app required) 4.7.5.90 Chrome 1Password e...