Comment 48 for bug 1850651

(In reply to Magnus Melin [:mkmelin] from comment #38)
> Does someone remember if the email (user) used to get pre-filled properly? (It's not atm.)
>
> When testing this fix we should remember to check the other providers too are working.

FWIW, in 68.2.0, it *is* possible to set up a new Yahoo! Mail account with OAuth, and the username is prefilled in the web login popup.