YouTube videos refuse to play on 0.4.8

[thomasseymour18901]

I have a number of other YouTube-related extensions added and enabled on Firefox. Everything worked fine until I re-enabled HTML5 Everywhere today.

[thomasseymour18901]

I disabled HTML5 Everywhere in the Add-ons menu, and YouTube worked fine again. It's definitely HTML5 that was causing the issue. This was the video I was trying to play: https://www.youtube.com/watch?v=7edujNVU6Aw

[thomasseymour18901]

In fact, I disabled HTML5 for just YouTube, and it worked fine again. I need this issue resolved soon! I'll gladly provide as much info as you need to get this solved.