One thing you can do is to download the clip. What is the web address of this clip? If you have problems with current Shockwave Flash plugin versions then check this: * see if there are updates for your graphics drivers '''https://support.mozilla.org/kb/upgrade-graphics-drivers-use-hardware-acceleration''' * disable protected mode in the Flash plugin (Flash 11.3+ on Windows Vista and later) '''https://forums.adobe.com/message/4468493#TemporaryWorkaround''' * disable hardware acceleration in the Flash plugin '''https://forums.adobe.com/thread/891337''' See also: * '''http://kb.mozillazine.org/Flash#Troubleshooting'''

It could be that this video is encoded in a way that isn't compatible with the Firefox HTML5 media player. *https://developer.mozilla.org/HTML/Supported_media_formats Can you post a link to a publicly accessible page (i.e. no authentication or signing on required)?