Another thing lots of applications with custom title bars get wrong: double-clicking the top-left corner of the window (where the icon is, usually) should close the application. (Firefox is an offender here, too, though Chrome is not.)
I had no idea this is a thing, which is.. surprising to say the least. That explains a lot of what I thought were crashes, but wow is that user hostile.
I'm really hesitant to say Firefox gets it "wrong" even if it is inconsistent.
