Netflix stopped working on my PC in Firefox. When I go to options-content and uncheck "play DRM content" it starts working. I realize the Primetime plugin is intended to facilitate playback of some content (DRM) which may not otherwise play via Silverlight/Flash plugins but unless I disable it it is actually preventing me from playing normal video content. As this is a Firefox/Adobe suggested plugin I would prefer it to function as intended rather than disable/remove it. I uninstalled Silverlight and re-installed it, but that did not make a difference. It was working fine a few weeks ago, bu tthat was the last time I tried to play a movie, so I'm not sure when this issue actually started, so I can't match it up with a particular update to anything that may have caused it.