The project was started in 2005, and initially led by Mozilla Corporation employee Deb Richardson in 2005. Documentation efforts have been led by Eric Shepherd since 2006.
The initial content for the website was provided by DevEdge, for which the Mozilla Foundation was granted a license by AOL. The site now contains a mix of content migrated from DevEdge and mozilla.org, as well as original and more up-to-date content. Documentation was also migrated from XULPlanet.com.
MDN has a newsgroup and an IRC channel #devmo on the Mozilla IRC Network. MDN is funded by the Mozilla Foundation and Mozilla Corporation with servers and employees.