I've seen so many questions about this over the internet asked many different ways and has been offered many different solutions that I've tried, but never can seem to find a solution! The problem is with flash videos not working in Firefox. The problem was originally isolated to just FF, but has now become universal to my other browsers (Explorer and Chrome). I can view videos on YouTube and various other sites just fine, however, other websites for school that require you to watch a video and respond to questions, simply load the video forever and don't play anything until the video has completely loaded, or simply play the sound but display a "frozen" thumbnail still frame. I've done everything, ranging from updating FF and Explorer, Adobe Flash (ActiveX and the Plugin version), updated Windows 7, "reset" FF, started FF in "safe mode", uninstalled and reinstalled Adobe Flash Player and Shockwave, uninstalled and reinstalled FF, cleaned the cache and scanned the registry. There has been two instances where the video played, but that was short lived. The situation quickly reverted back to loading forever or playing sound only with the still frame. The problem has been going on since maybe March 2013. Might help to know I am running Windows 7, 64 bit, and I am fully updated on all programs and plugins.