Youtube not working in Firefox 31 (or the latest Waterfox).

Youtube videos play a brief one or two segment portion of the video, stutter for a moment and repeat a few frames, and then go to the black screen with the white loading circle. Sometimes it remains, other times it goes to an error screen.
The weird thing is that the videos will play when I first start my computer for a time. I can watch several if I go to a Youtube video soon after I power on. However, after a period of time, the issue starts without fail.
Since I installed the latest Firefox (and the latest Waterfox) this issue has been present. It's present only in Mozilla based browsers. Chrome, Internet Explorer, and Safari all work fine and play videos with no problems at all. It is also exclusive to Youtube as near as I can tell. Flash videos from other sites all run fine. I've tried several and they play without issue. That seems to indicate it's an issue with the Mozilla browser and not Adobe or Youtube.
Things I have tried: Running in Safe Mode, Clearing the Cache, uninstalling and installing Adobe Flash Player, Uninstalling and reinstalling Firefox and Waterfox, scanning for Malware, Adware, and Viruses, clearing out all tabs and using a fresh instance, and making sure the Firefox and Waterfox processes are shutting down properly in the task manager. [Both have a tendency to not shut down when I close the browser, but that's a minor thing that's been going on for a while.]
The Youtube issue has only plagued me since I updated both Firefox and Waterfox. I usually use Waterfox as I have a 64bit system, but the same thing happens even if I run Firefox exclusively.
As I said, rebooting my computer temporarily resolves the issue and is the only way to get the browser to play Youtube videos. It consistently repeats after a time without fail and only occurs in the Mozilla browsers since the latest update.

Phillip was pretty helpful and told me about enabling html5 for youtube content: [https://www.youtube.com/html5] and this will be enforced by google soon in version 33.

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