Interesting feature, but it looks like this has some rough edges. I saw this option a little while ago today from the browser extension (latest version of Firef

Interesting feature, but it looks like this has some rough edges. I saw this option a little while ago today from the browser extension (latest version of Firefox on Windows) when I created a new item and wanted to generate a password for it (I didn't want to generate the username since it was assigned by the service), but it wasn't possible to select either of the radio buttons to choose between username and password and the regenerate button also didn't seem to work. I didn't have time to dig in further, and so I chose to generate a passphrase and use that.