Firefox and Palemoon come back to the login every time with those 2 browsers.
https://192.168.10.206:444 is requesting your username and password. The site says: “IPFire - Restricted”
This server could not verify that you are authorized to access the document requested.
Either you supplied the wrong credentials (e.g bad password), or your browser doesn’t understand how to supply the credentials required.
No problem with Waterfox-classic but latest Waterfox-G3 has the same problem.