That doesn't really matter. There's basically no usability difference between:
"You need to install plugin X to view this video."
"You need to install QuickTime Component X to view this video."
"You need to install third-party Firefox codec X to view this video."
Except that the third piece of software likely won't exist, and Mozilla might not even let it exist.
If browser vendors make it hard to install and use a codec for patent-encumbered formats like H.264, that will only prolong the use of even worse plugins like Flash for the purpose of playing H.264 videos.
