1. DOM MutationObserver – reacting to DOM changes without killing browser performance.

    • by Jeff Griffiths • Add-ons, DOM, Event, Firefox, Nightly • 11 comments

    DOM Mutation Events seemed like a great idea at the time – as web developers create a more dynamic web it seems natural that we would welcome the ability to listen for changes in the DOM and react to them. In practice however DOM Mutation Read more…

  2. Introducing Aurora 11 with tons of new features and improvements

    • by Robert Nyman • Audio, Aurora, DOM, Featured Article, Firefox, HTML5, Performance • 47 comments

    We have now released Aurora 11, soon to become Firefox 11, and wanted to cover all the the things we have improved in this Read more…

  3. Announcing Firefox Aurora 10

    • by Joe Stagner • Aurora, Developer Tools, DOM, Feature, Featured Article, Firefox, HTML5, IndexedDB, WebGL • 19 comments

    We’re happy to announce the availability of Aurora 10. (Download and Test Aurora 10) In additional to the normal improvements that you’ve come to expect like performance, security and bug fixes, Aurora 10 focuses in HTML5 enhancements. New additions HTML5 Visibility API createProcessingInstruction WebGL antialiasing Read more…

  4. Introducing Aurora 9

    • by Robert Nyman and Christopher Blizzard • Aurora, CSS, DOM, Feature, Featured Article, Firefox 9, HTML5, XMLHttpRequest • 29 comments

    We have just released Aurora 9 (download and test Aurora 9), which is planned to be the upcoming Firefox 9. In it, we have a number of new things that we hope will get you Read more…

  5. Tagging docs for sprint at JSConf.eu October 1-2

    • by Janet Swisher • Conferences, Docs, DOM, JavaScript, MDN, Sprints • No comments yet

    We’re very excited to announce that Mozilla is sponsoring the Hacker Lounge at JSConf.eu and we will be holding a doc sprint at and during the conference. The focus of this doc sprint will naturally be docs for JavaScript and DOM. We hope to encourage Read more…

  6. Animating with javascript: from setInterval to requestAnimationFrame

    • by louisremi • Animations, DOM, JavaScript • 6 comments

    Animating DOM elements[1] or the content of a canvas is a classical use case for setInterval. But the interval is not as reliable as it seems, and a more suitable API is now available… Animating with setInterval To animate an element moving 400 pixels on Read more…

  7. A call for quality HTML5 demo markup

    • by Chris Heilmann • CSS, Debugging, DOM, HTML5, Images, JavaScript, Standards, Web Developers • 10 comments

    HTML5 is a necessary evolution to make the web better. Before the HTML5 specs were created we used (and still use) a hacked together bunch of systems meant for describing and linking documents to create applications. We use generic elements to simulate rich interaction modules Read more…

  8. HTML5 adoption stories: box.net and html5 drag and drop

    • by Christopher Blizzard • Device APIs, DOM, Drag and Drop, FileAPI, Firefox 3.6, Firefox 4, HTML5, XMLHttpRequest • 12 comments

    This is a guest post from Tomas Barreto, a developer who works at box.net. They recently adopted HTML5 drag and drop as a way to share files with other people using new features in Firefox. The included video is a pitch for the feature and Read more…

  9. Firefox 4: Better performance with Lazy Frame Construction

    • by Paul Rouget • DOM, Firefox 4, Performance • 40 comments

    This is a re-post from Timothy Nikkel’s blog. Lazy Frame Construction is new to Gecko and allows many DOM operations (appendChild, insertBefore, etc) to not trigger immediate reflows. This can vastly improve the interactive performance of very complex web pages. If you want to test Read more…

  10. multiple file input in Firefox 3.6

    • by Paul Rouget • Device APIs, DOM, Feature, Featured Article, FileAPI, Firefox, Firefox 3.6 • 28 comments

    Firefox 3.6 supports multiple file input. This new capability allows you to get several files as input at once, using standard technologies. This is a big improvement, since you used to be constrained to one file at a time, or needed to use a third Read more…