Firefox 29 cannot play HTML5 videos

I have been trying to play videos on Vimeo on Firefox, but all I can see is a black screen instead of the video, even though I can hear the audio. This problem occurs with all websitest that host HTML5 videos. I have observed that this problem mainly occurs for videos of the type H.264/MP4.
I have tried disabling all extensions but the problem persists. However, if I choose Restart with Addons Disabled, then the problem gets resolved and I am able to view the Video and hear the sound as well.
I cannot imagine what's wrong. I have Disabled Hardware Acceleration and even Reset Firefox and the problem still persists.
Please help.

For issues with HTML5 videos, you can try to disable the HTML5 media player by setting a few prefs to false on the <b>about:config</b> page.
* media.windows-media-foundation.enabled = false
* media.directshow.enabled = false
You can open the <b>about:config</b> page via the location bar and you can accept the warning and click "I'll be careful" to continue
*http://kb.mozillazine.org/about:config

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