BeardedSpice CGCookie extension
There's a really cool (open source and free) Mac app called Bearded Spice I thought you might like, it lets you use the Mac's play/pause/forward/backward buttons to control sites like YouTube/Vimeo/Udemy/etc...
I use it a lot while following courses on those sites, it saves me the hassle of going back and forth from Blender to the tab playing the video.
Anyways, I made a CGCookie extension for it, so now you can use it on this site as well, it's available here:
Just download it, install BeardedSpice and add it as an extension.