How can I make videos mp4 play in Firefox?

YouTube works fine. Websites to play videos, no problem.
But then I'll go to a site and see a message stating that the video is either damaged or is not supported.
When I search how to play mp4 in Firefox, I find myself on this site:
http://www.jwplayer.com/blog/the-State-of-HTML5-Firefox-now-supports-MP4/
With the huge headline MP4 supports Firefox now.
No, it * ing is not!
A little frustrated, because everywhere I look for help on this point, I met pages saying this should work, Firefox supports mp4 etc, GOLD forums where we webmakers ask the question and then the solution is something wrong in their codes - that doesn't help me, the lonely end user.
When I go to this suggested test site: http://techslides.com/demos/sample-videos/small.mp4
I get the error message: unable to listen to video because the file is corrupted.
No, it isn't. I can download and play on WinAmp.
When I go to this suggested test site: http://www.html5videoplayer.net/html5video/mp4-h-264-video-test/
I get the error: no video with format supported and MIME the type found.
Huh? Once again, I can download and play it fine.
But he won't play Firefox.
so
Is there a fix in the wind?
Is there something I can tweak or change to make Firefox recognize and play this sort of thing?
Y at - it a plugin/extension/addon that I should download to read mp4?
If this is a known issue that will be fixed later, is there something I can do as a substitute (IE a plugin for now)?
Because it seems that the only alternative is to give up Firefox and start using Chrome, which has no problem with the above videos.

You may need this in case you have no support for MP4 files:

Windows Media Feature Pack for Windows 7 N and Windows 7 KN:

Also, make sure that these preferences have the default value:

  • Media.Windows - Media - foundation.enabled
  • Media.DirectShow.Enabled

You can open the topic: config page via the address bar.
You can accept the warning and click on "I'll be careful" to continue.

Tags: Firefox

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