I've read about these problems and sadly it eventually causes weirdness for the Firefox profile over time. People have spoken about this over on the Mozilla forums.
As of the latest release (37), Youtube now defaults to the HTML5 player and is flawless, giving full 60fps options for 60fps videos. I can now see my game videos as I recorded them, yay!
Weirdly the auto-updater isn't picking up v37 for me.
It's in the pipeline now.
Firefox ftw right?![]()
Meh! Chrome is where it is at now
Still a fan of FF but I just prefer chrome now for a few reasons:
1. get all the new features like the 60 fps for YT first (think chrome has had 60 fps since October 2014)
2. chrome remote desktop app
3. the font seems smoother on chrome, firefox looks very thin and not aliased? Especially noticeable on this forum
Firefox handles GIF threads so much better though!