Not Perfect, but *Very* Good Puntuado con 4 de 5 estrellas

A lovely little add-on. Elegant in the simplicity of both its installation and usage. Allows me (in Canada) to view all of PBS videos and BBC iPlayer videos. Sadly, does *not* allow viewing of National Geographic channel videos nor several other U.S. & British 'stations'. If the developer would be able to tweak Media Hint to allow the viewing of a few more key U.S. and British websites, it would be virtually a perfect add-on. As it is now, it's still extremely useful and appreciated.
[Using Firefox 23.0.1 / Windows 7 and have not noticed any slowing of performance.]