MDN’s new design is in Beta! A sneak peek: https://blog.mozilla.org/opendesign/mdns-new-design-beta/

The Mozilla Toolkit is a set of programming interfaces (APIs) built on top of Gecko which provide advanced services to XUL applications. These services include:

  • Profile management
  • Chrome registration
  • Browsing history
  • Extension and theme management
  • Application update service
  • Safe mode
  • Printing

Official references

See also

The following developer pages contain examples and discussions of particular topics: