Mozilla Support has announced the Firefox Screencast Contest, a competition where Firefox users and fans are invited to submit a screencast for one or more of the top 100 Firefox Support Knowledge Base articles.

The contest rules note that screencasts must be done with Firefox 3 on any of the supported platforms (Windows, Mac, Linux), in English only at this time.

Participants must upload their pieces to some hosting service and submit the URL to enter the contest. TechSmith’s Jing is recommended though not required. Yes they already know it’s Flash and proprietary.

The contest runs from today until June 15 and is open to all earthlings 18 and older, unless you live in Cuba, Sudan, Iraq, Iran, Syria, North Korea, Myanmar, Quebec or Puerto Rico.

Yes there are prizes: a contest T-shirt for the best screencast for each top 100 article. Best screencast overall takes a neat Flip video camera.

For complete details check the Firefox Screencast Contest home page.