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Passing tests and has abysmal performance on basic web features. Not to mention how many security issues are present. Its unserious to suggest it as an alternative at this stage. It make people think they dont have to support firefox because there is alternatives just around the corner.

nobody is suggesting that it is a viable alternative, i am just arguing that it is not imaginary science fiction either

the acid test is surfing the web. it doesn't matter how many tests it passes if users can't get to the sites they want and use them the way they want because their browser doesn't support some feature properly or because gets rejected by the sites for not being Chrome/Safari/Firefox.

if sites break despite passing all tests then the tests would be incomplete.

as for detecting that the browser is not chrome/safari/firefox, the days where you could trust the user agent value to reliably identify a browser are long gone. ladybird will just have a value that will make it pass any checks.

How much does Firefox pass? 99.99%?

Right. I think the "last mile" compliance is where it gets most challenging.