[cromwellian]

I'm not really sure OO vs functional is the real impedance mismatch. The big impedance mismatch is the fact that the browser is fundamentally asynchronous event model driven, and so a language without lexical closures makes event oriented programming overly verbose.

But stuff browser-APIs I don't feel mismatch either OO or functional style, and some of the IDLs behind the C++ browser APIs are explicitly OO type hierarchies. There's somewhat of an impedance mismatch between WebIDL and Javascript itself if you look at the language binding source.