YouTube works fine. Other websites play videos, no problem. But then I'll go to a website and see a message that the video is either corrupt or is not supported. When I search for how to play mp4 in Firefox I end up at this site: With the huge headline Firefox Now Supports MP4. No, it ****ing doesn't! A bit frustrated, because everywhere I look for help on this, I either come across pages saying it should work, Firefox supports mp4 etc, OR forums where it's webmakers asking the question and then the solution is something wrong in their coding - which doesn't help me, the lonely end user.

When I go to this suggested test site: I get the error message: Video can't be played because the file is corrupt. No, it's not.

Pc36img Zip Evo 4g Rate. Easily download Youtube videos as MP4 or FLV with Firefox and a plugin. This plugin is for Firefox only. It will add a nice download button below every youtube video near the thumbs up/down buttons. Using this plugin, videos. Mar 05, 2011 How to download Youtube mp4 videos on Mac using Firefox.

I can download it and play it on WinAmp. When I go to this suggested test site: I get the error: No video with supported format and MIME type found. Again, I can download and play it fine. But Firefox won't play it. Soooooo Is there a fix in the wind?

Is there something I can tweak or change to make Firefox recognize and play this stuff? Is there a plugin/extension/addon that I need to download to play mp4? If this is a known problem that is going to be fixed eventually, is there something I can do as a substitute (ie a plugin for now)? Because it seems like the only alternative is to abandon Firefox and start using Chrome, which has no problem with the above-mentioned videos. YouTube works fine.