Video doesn't play with Firefox Nightly's hardware accelerated video
From Arch Linux, extra repo. All 0.3.17-1.
Video worked perfectly, but when I turned on Nightly's GPU acceleration for video, YouTube video literally didn't load. I could see by the bar that it had actually received the video, but when I hit play it just loads. Non-accelerated video works elsewhere in other applications. Haven't tested hardware accelerated video in other apps, may test later.
Thinking it might be an issue with Nightly, but just submitting in case it isn't