MDN’s new design is in Beta! A sneak peek:

Type: URI
The URI of the overlay contents of preference pane. If this is not specified, the contents of the prefpane element is used.

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 Contributors to this page: Sheppy, ethertank, trevorh, pippijn, Marsf, mrolappe, Mgjbot, BenoitL, Ptak82, Dria
 Last updated by: Sheppy,