Whenever a new Firefox release drops, my favorite thing to do is to see if this (now ten-year-old) bug [0] is finally fixed.
Spoiler: it isn't.
This bug (and many others similar to it) are one of the main reasons I dislike using Firefox. It just feels out of place on macOS. I'm fine with non-native UI elements as long as they're not elements as fundamental as the select dropdown and the right-click menu.
Edit: Turns out this bug has been fixed, but only if you have Electrolysis [1] enabled [2].
Spoiler: it isn't.
This bug (and many others similar to it) are one of the main reasons I dislike using Firefox. It just feels out of place on macOS. I'm fine with non-native UI elements as long as they're not elements as fundamental as the select dropdown and the right-click menu.
Edit: Turns out this bug has been fixed, but only if you have Electrolysis [1] enabled [2].
[0] https://bugzilla.mozilla.org/show_bug.cgi?id=402625
[1] https://wiki.mozilla.org/Electrolysis
[2] https://bugzilla.mozilla.org/show_bug.cgi?id=402625#c32