Firefogg is currently only available for Firefox 3.1/3.5 betas; for other browsers or if you can’t install the extension you’ll still need to convert your videos before uploading.

(In-browser playback is still handled the same way we’ve been doing it — selecting the browser’s native video support (for Firefox 3.1/3.5 betas), existing plugins, or a Java player applet as a fallback.)

We don’t yet have a firm timeline for integrating all these things to Wikipedia by default, but you can test out some of it by loading up the custom JavaScript that Michael mentions in the post — the cool thing is that the Firefogg uploads can be used without any changes to the core MediaWiki.

(The add media wizard is dependent on some new stuff for copying files from offsite sources like Metavid and Archive.org, so right now those only work on test.wikipedia.org.)