I only have Firefox 106 (stable) to test with, with no third party extensions except for an extension to set XDebug cookies for debugging PHP. I tried taking a backup of a Joomla 4.2.4 site on PHP 8.1.10 with the dev release of Akeeba Backup I asked you to use. I am restoring it on a server which is also using PHP 8.1.10, on an empty database. I cannot reproduce your issue.
Then I looked at your screenshot again and the problem became apparent to me. You have entered the password ONCE. You need to enter the password in both fields: the one labeled “Password” and the one labeled “Password (repeat)”. The two passwords must match. When they do not the e-mail field is disabled which means it is not submitted in the form to the browser. The server then sees a super user ID (from the drop-down), no email address, a password, and no password confirmation. The server validates the fields in this order. First it checks for a super user ID. It exists, it is valid, okay. Then it checks for an email address. No email address specified; spits out an error and stops doing anything else.
I am 99.9999999% sure that you did NOT mean to enter a password there. Most likely your browser auto-filled that for you. Empty the password before clicking on Next.
Nicholas K. Dionysopoulos
Lead Developer and Director
🇬🇷Greek: native 🇬🇧English: excellent 🇫🇷French: basic • 🕐 My time zone is Europe / Athens
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