I doubt Gecko is handling the media recorder API. More likely it’s Spidermonkey on most platforms and JavaScriptCore on iOS. MediaRecorder is a working draft.

I doubt Gecko is handling the media recorder API. More likely it’s Spidermonkey on most platforms and JavaScriptCore on iOS. MediaRecorder is a working draft. Developers who use draft API and don’t even bother to test on other platforms are cowboys.