XBMC Fox with YouTube Support
This is an extension for Firefox that adds a new option to the right click menu which will send video and audio URLS to XBMC (Xbox Media Center) for playback.
It also allows you to paste the URL of a file on the web into a textfield and have it play on your TV.
Install this extension like you would any other, usually just dragging the XPI file into the browser works well.
Once installed, restart Firefox, then goto Tools -> Add-ons and select XBMC Fox
Press the Options Button at the bottom of the window
In the options box type in the ip address of your xbox.
Make sure that the webserver is enabled on your XBMC by going to: Settings –> Network -> Servers -> Web Server
Go to a website that links directly to media files and right click on a link and goto ‘Send This To XBMC’.
For YouTube you can use any links of the form http://www.youtube.com/watch?v=i_Cw0QJU8ro
You can also go to Tools – Paste URL to XBMC and paste in the URL to any audio/video file.
Based on the original XBMC Fox