MediaWiki:Requestaccount-text
From MozillaWiki
Complete and submit the following form to request a wiki editor account.
Be sure that you first read MozillaWiki:Accounts before requesting an editor account - you do not need one to read the wiki.
Once your account is approved, you will be emailed a notification message with password and will be able to log in via the User login page.
If you are having trouble requesting an account, please file a bug via bugzilla or ask on Mozilla Matrix in wiki.