Script Summary: Embeds linked audio and video into Wiki articles using the new HTML 5 audio and video tags.
This applies to any link that points to an OGG or WAV file (as these are the only ones currently supported by Firefox).
When you click on such a link, the script inserts the video player above the link and plays the video. For audio files, they are played without showing the controls. However, if you click the link again, then they are shown.
The script is available on any pages that have "/wiki/" in them. The script was mostly intended for Wikipedia, Wiktionary and Wikimedia Commons but it might help elsewhere too.
You need Firefox 3.5 or later.