Watching YouTube video full screen while working in other monitor
So after upgrading to Mavericks when I have a Chrome browser window with a youtube vidoe loaded and I click to watch fullscreen my other monitor is taken over with a grayed out background. Quicktime started doing this awhile back, and Vimeo used to do it in Mountain Lion when it was embeded in another site, but if I went to Vimeo.com to watch a video this didn't happen. How do I change this?
FYI, I have all Mission Control / Spaces options unchecked as I don't use that and don't want multiple Menu bars and whatnot.
MacBook Pro, OS X Mavericks (10.9), HP w2408 Monitor