1. School of Webcraft
  2. HTML5
  3. Firefox 4 RC
  4. Addons Builder Preview

  1. School of Webcraft

    Mozilla and P2PU are creating the School of Webcraft, a powerful new way to teach and learn web developer skills. Classes are globally accessible, 100% free, and powered entirely by learners, mentors and contributors like you people. Our goal: a vibrant, peer-led system that helps people around the world easily access and build careers on open web technology.

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  2. HTML5

    Mozilla continues to lead the charge in the adoption of HTML5 and other evolving open Web technologies. Find out more about the HTML5 spec and the latest enhancements in HTML5, CSS3 and other developer features for Firefox 4.

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  3. Firefox 4 RC

    Test the next version of Firefox and help us make the world's best browser even better. Firefox 4 advances the modern web and we have a big chart full of check marks to prove it.

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  4. Addons Builder Preview

    Use Add-ons Builder to quickly and easily develop an extension for Firefox using common web technologies. There is a tutorial to get you started and a variety of APIs in the core library to add functionality to Firefox.

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News & Updates

Highlighted Mozilla Developer News & Updates

  • How to resume a paused or broken file upload

    This is a guest post written by Simon Speich. Simon is a web developer, believer in web standards and a lover of Mozilla since Mozilla 0.8 (!). Today, Simon is experimenting with the File API and the new slice() method introduced in Firefox 4. Here is how he implements a ...

    Written by Paul Rouget on April 8, 2011

  • Mark Finkle (mfinkle): Firefox Mobile – Monitor HTTP Headers

    I just added support to Mobile Tools for monitoring HTTP headers in Firefox Mobile. I just wanted a way to look at some HTTP traffic to help debug some mobile websites. Screen space is limited on mobile devices, so we don’t get to have nice floating panels like in desktop ...

    Written by Mark Finkle on April 13, 2011

  • Update on Add-on Performance Testing

    Just over a week ago we announced our add-on performance initiative and have received lots of feedback from add-on users and developers. Thanks to our awesome community, many developers have updated their add-ons to have faster start-up time, and others have dug into the results and filed bugs to help ...

    Written by Justin Scott (fligtar) on April 13, 2011

  • Firefox parties, Spark and Ember, Meet the Creative team and more…

    In this issue… Firefox parties in full swing Being a localizer in the rapid release cycle New Adventures for Spark and Ember Know your creative! Design this book Get Personas is getting a new home Software updates Upcoming events Community Calendar About about:mozilla Firefox parties are in full swing With ...

    Written by Mary Colvig on April 13, 2011

Docs

Key Topics for Web Developers

Mobile

Learn more about Fennec and mobile-specific technologies like geolocation.

Add-ons

Build your own add-ons and discuss them with the add-on developer community.

Mozilla

See how you can participate in localization, quality assurance, and other Mozilla projects.