In-browser treatment of HTTP auth is just shockingly bad. But Firefox seems to be somewhere you get rewarded for introducing new features rather than fixing bugs.
My biggest annoyance is that since the login modal blocks the rest of the UI, I can't use my password manager!
(At least, I can't use Bitwarden, but I can't imagine how any other browser-plugin-based password manager would get around this.)
At the time I thought that was cool, and was sad when it went away with the new plugin architecture, but looking back it does indicate quite how bad the situation was with that old plugin format.
>But Firefox seems to be somewhere you get rewarded for introducing new features rather than fixing bugs.
Something else they are copying from Google!