I am just watching a football match in a tiny window on Paddy Power's website. Unfortunately it's in a small video preview window and it doesn't allow you to full screen it.
I set about investigating the website code to see what could be done. By 'inspecting' the code I discovered the iFrame which plays the video and by manipulating that code you could get the video playing much larger which was quite useful and nearly the full screen video that I wanted in the first place.
However I then discovered a Chrome browser add on that does all this for you and you just need to do one click and everything occurs automatically. Install this great browser add on and you too can full screen tiny videos really easily!
Download this excellent browser add on HERE