This is an effort to extend Vim syntax files for Mozilla contributors and web developers:

• cpp.vim: C++ additions for Gecko components and macros
• css.vim: updated syntax file with CSS3 and HTML5 support
• html.vim: updated syntax file with HTML5 support
• javascript.vim: TBD, aiming to get some support for ES6 and the DOM API.

A Vim syntax file for JSON would be nice to have, too.

Contributions are welcome.