Also should change the match of the second rewrite to the following so that addresses like http://mozilla.org/projects/mathml/something/else will also redirect to MDN.

    ^/(\w{2,3}(?:-\w{2}(?:-mac)?)?/)?projects/mathl.*$

Also, we might want to make sure these changes will not mess up the existing redirects in the mozilla.org/.htaccess file published in the SVN directory -- like the Fonts redirect.