I do have some issues with the player plugin used for playiing server side stored videofiles on some PC's with WIN7 Firefox 21. (The side setting does work well on IE and on some PC with little to no Firefox plugins and or local installed videoplayers (like Quicktime, Winamp, Realplayer).

Joomla V 2.5.6

The page with the issues:

www.kirche-hsw.de/index.php/angebote-2/konzerte/thlokomela-mai-2013

and this is the displayed errror message:
"The video could not be loaded, either because the server or network failed or because the format is not supported: www.kirche-hsw.de/images/Thlokomela_Videos_2013/m4h00461-low.mp4undefinedundefinedundefinedundefinedundefinedundefinedundefinedundefinedundefinedundefinedundefinedundefinedundefinedundefinedundefinedundefinedundefinedundefinedundefinedundefinedundefinedundefinedundefinedundefinedundefinedundefinedundefinedundefinedundefined"

I did try a lot of different setting, but could not solve the issue yet.

Thanks for helping me.
Bernd