Very Annoying Firefox Video Problem

I love Firefox.  But I am having a problem that may force me back to Internet Explorer.

Can someone please tell me why, why a million times why, when I want to watch a video of the Loch Ness Monster (how do they know it’s a monster, but I digress) or just about any other non-YouTube video, I get this:

I can’t believe in this day and age when everything is about online video, Firefox can’t figure out how to play a frickin’ video.  And if this is some stupid thing Microsoft is causing, why some hacker in Sweden or somewhere hasn’t hacked away this annoyance.  I tried this, and it didn’t help.

This really irritates me.