1. an HTML5 offline image editor and uploader application HTML5

  2. Firefox 4 Beta: Latest Update is Here, with WebGL

  3. CSS 3D transformations in Firefox Nightly

  4. Firefox 4: Drawing arbitrary elements as backgrounds with -moz-element

  5. using HTML5 video with fallbacks to other formats

  6. content aware image resizing

  7. WebGL for Firefox

  8. audio player – HTML5 style

  9. geolocation with open street maps

  10. offline web applications