mozilla-mplayer 3.50 under ubuntu 8.04 and firefox 3b4
When playing back the embedded videos in http://www.cbc.ca/news/
(on the upper right), after hitting the "play" button a window pops up with the video. The playback is OK and finishes OK, after I close the window I start noticing "zombie" mplayer processes that show up in my system monitor. Quite a few of them.
In previous pluggin versions on firefox 2, this "un-embedding" never happened. Other streams (see below for bbc) do not "automatically un-embed".
I don't notice zombies or un-embedding when playing back Real Video media from the http://news.bbc.co.uk/ (I notice, though, that my configuration setting "black-background=1" is not completely honoured (there is a black strip below the 15:9 video.