Test docs account credentials

I'm trying to play around with some major changes to HTML element
documentation, but I can't seem to log into the
https://docs.webplatform.org/test/ site.

It *looks* like I should be able to use my
https://docs.webplatform.org/wiki/ credentials, but those don't work.

I created an account, but it shows up as "Firefox Accounts" and where's
that name come from? This is also confusing. After activating account and
using said credentials, it redirects me to the test wiki, but shows an
error message: "Execution messages/Unknown error, Could not get profile
data or create new user".

How should I proceed?

I'm probably going to automate much of this process with a bot, any advice
on how to do that?

Thanks,

Austin Wright.