Firefox OS App Days: It's a Wrap!

Over the last few weeks, Mozilla sponsored a worldwide series of hack days for developers to learn about creating apps for Firefox OS. Dubbed “Firefox OS App Days,” the events took place in more than 25 locales around the world, starting on 19 January in Mountain View, California and ending on 2 February in Berlin, Germany. The events were organized with the support of our Mozilla Reps, the Mozilla community and Firefox OS partners Telefonica and Deutsche Telekom in Africa, Asia, Europe, New Zealand, as well as North and South America.


Hacking at a Firefox OS App Day

2,500 New Developers for Firefox OS

Our goals were to educate developers around the world about Firefox OS and open web apps and inspire them to start building apps for the Firefox Marketplace.

We engaged with over 2,500 developers worldwide. Hundreds of apps were demonstrated at the events, and many of them have already been submitted to the Marketplace. Some of the apps developed include:

  • Bessa – An image editor for Firefox OS, demonstrated in Berlin
  • Web Sliding Puzzle – a sliding puzzle game made from the Firefox OS App Days logo, demonstrated in Paris by Mathieu Pillard
  • Ash’s Rising – a strategy game, demonstrated in Toronto
  • Travel Saver – a local travel app, demonstrated in Warsaw
  • FoxKehCalc – a Fox-themed calculator, demonstrated in Tokyo

In addition to apps, we saw over two million impressions of the #firefoxosappdays hashtag on Twitter, and hundreds of photos from the events were posted on Flickr, Facebook and other social media sites.

Sample of Apps Developed at Firefox OS App Days

Sample of Apps Developed at Firefox OS App Days

Going Forward

Thanks to everyone who participated in the App Days, and if you haven’t submitted your app to the Marketplace yet, please do so as soon as you can. If you have a website or github repo hosting your app or a post about your App Day experience, please add your links to the comments below. We’d love to hear from you and check out your apps in progress. If you missed the events, or there wasn’t one in your area, stay tuned — our Mozilla Reps team plans to enable more in the near future.

And if you are just hearing about Firefox OS, and want to get started developing apps on your own, the Developer Hub, the Hacks Blog and the Mozilla Developer Network are excellent places to start. To stay in touch with upcoming App Days, developer phone releases, and app development news, subscribe to our monthly Firefox Apps & Hacks newsletter.

About Mark Coggins

Mark is the former SVP of Engineering at Actuate, a public company in the Business Intelligence space. He is co-founder of the BIRT open source project at the Eclipse Foundation, and is the author of six crime novels set in the Silicon Valley.

More articles by Mark Coggins…


  1. Vineel, Mozilla India

    Below are some of the favorites from Firefox OS App Day – Bangalore:
    1. Event App:

    2. Stockwatcher App:

    Github Url is:

    manifest url:

    Firefox MarketPlace url:

    3. Pitstop App:

    4. Indic typing tool: (also live at

    5.Browse with me app:

    — Submitted to Marketplace as ‘Browse With Me’


    February 13th, 2013 at 04:19

  2. havi hoffman

    Thanks for pointing these out Vineel. Pls post your local favorites or personal picks of the Apps you saw at FirefoxOSAppDays. Thanks to everyone who helped make them great!

    February 15th, 2013 at 09:16

  3. Greg Coughlin

    My personal favorite app from the Firefox OS App Days is Bessa. It is a really handy image editor and I have worked on it a lot. For personal usage, I think the GroupDocs Viewer plugin for Firefox is really helpful as well and you can check out the github link here:

    For developing add-ons on for Firefox, I use add-on builder and SDK and the best resource which has been quite helpful is:

    I will definitely stay in touch for the upcoming OS App days. Thanks for the post!

    February 18th, 2013 at 08:59

  4. sole

    My post about the app day in London: :-)

    Thanks again for organising this! Had a terrific time there!

    February 26th, 2013 at 02:52

    1. Robert Nyman [Editor]

      Thank you!

      February 26th, 2013 at 16:46

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