Firefox 3.6.6 hogs CPU 100% when playing embeded ogg video

it's really not content-related. I played the same content with an external player, and the cpu load varied between 12-40% with spikes to 50%.
HTML5 video support is great, the performance not so. Any hints?

Firefox 3.6.6 Windows XP - often goes to 80-100% CPU even with only one tab open (in this case the one I'm writing this message on). When this happens the only cure is to kill it with task manager and start again.

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