My Joomla web site working quite fine except one thing. The videos does not display, and this only concerns Firefox browser. Chrome and IE is ok.
In the beggining was ok but I have no idea what might happened, now there is no video.
Pls, go to my web and check:  www.szlifowaniebetonu.pl/index.php/filmy/szlifowanie-betonu
Web is in polish, but be informed all the left menu refers to different videos. 
Any suggestions ????