fennec is up to version 10 for meamo on the nightly builds. the last 'offical release' was version 7. who knows how long more it'll go on though as the first poster said.

fennec 10 plays html5 videos
microb doesn't.
opera doesn't.
chromium doesn't.

if opera doesn't play html5 by now it may never do so as opera basically 'invented' html5 video.

edit: i love opera btw and use it more than microb now since the latest version.