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  1. Firefox OS, Animations & the Dark Cubic-Bezier of the Soul

    I’ve been using Firefox OS daily for a couple of years now (wow, time flies!). While performance has steadily improved with efforts like Project Silk, I’ve often noticed delays in the user interface. I assumed the delays were because the hardware was well below the “flagship” hardware Read more…

  2. ES6 In Depth: An Introduction

    Welcome to ES6 In Depth! In this new weekly series, we’ll be exploring ECMAScript 6, the upcoming new edition of the JavaScript language. ES6 contains many new language features that will make JS more powerful and expressive, and we’ll visit them one by one in Read more…

  3. Easier in-app payments with fxpay

    For developers building web applications on Firefox OS or Firefox Desktop, supporting payments is easy with Mozilla’s fxpay library. In addition to accepting credit cards, Mozilla’s payment system lets users charge purchases directly to their phone bill in many countries—making it ideal for mobile commerce. Read more…

  4. Network Activity and Battery Drain in Mobile Web Apps

    Editor’s note: This post describes the work of a group of students from Portland State University who worked with Mozilla on their senior project. Over the course of the last 6 months, they’ve worked with Mozillian Dietrich Ayala to create a JavaScript library that allows Read more…

  5. Creating a mobile app from a simple HTML site: Part 2

    Or: Making our simple app work for others In the first part of this series, which began late last year, we worked through the process of developing a school planner app. At this point (see the final code from Part 1) we’ve got multiple school Read more…

  6. Drag Elements, Console History, and more – Firefox Developer Edition 39

    Quite a few big new features, improvements, and bug fixes made their way into Firefox Developer Edition 39. Update your Firefox Developer Edition, or Nightly builds to try them out! Inspector The Inspector now allows you to move elements around via drag and drop. Click Read more…

  7. Mobile game development with the Device Orientation and Vibration APIs

    The market for casual mobile gaming is keeping pace with the growing market for smartphones. There are Web tools that can help web developers like you build games that compete with native games. You’ll need great execution to stand out from the crowd – using Read more…

  8. Trainspotting: Firefox 37, Developer Edition and More

    Welcome to Trainspotting, a new series on Mozilla Hacks designed to help the busy Web developer keep up with what’s new, what’s changed and what is coming soon in all of the Firefoxes, the Web platform, and the tools for building the Web! Mozilla develops Gecko Read more…

  9. Peering Through the WebRTC Fog with SocketPeer

    WebRTC allows browsers to do things they never could before, but a soup of unfamiliar terminology and the complexity of the API makes for a steep learning curve. After spending several weeks neck-deep in example code and cargo-culting several libraries, I have emerged with a Read more…

  10. Pixel Perfect 2: extension for Firefox Developer Tools

    Pixel Perfect is a Firefox extension that enables web designers to overlay a web page with semi-transparent images (layers). The designer can then tweak the page’s content until it exactly matches the Read more…