WWW YouTube videos now default to HTML5

[Second Summer]

Four years ago, we wrote about YouTube’s early support for the HTML5 <video> tag and how it performed compared to Flash. At the time, there were limitations that held it back from becoming our preferred platform for video delivery. Most critically, HTML5 lacked support for Adaptive Bitrate (ABR) that lets us show you more videos with less buffering.

Over the last four years, we’ve worked with browser vendors and the broader community to close those gaps, and now, YouTube uses HTML5 <video> by default in Chrome, IE 11, Safari 8 and in beta versions of Firefox.

More: YouTube Engineering and Developers Blog: YouTube now defaults to HTML5 <video>

I wonder why YouTube doesn't use the HTML5 video format with regular/recent versions of Firefox ... Foul play, I wonder?