Thunderbird2 has tag functionality. However, the UI is not good enough. Methods to add tags are annoying if you have many tags. Attached tags are difficult to recognize. Tag Toolbar facilitates the tag functionality.
Firefox extension that lets you visualize any web page DOM tree in 3D. It is being developed by Victor Porof (3D developer responsible with the Firefox extension itself), along with Cedric Vivier (creating a WebGL optimized equivalent to the privileged canvas.drawWindow, see #653656) and Rob Campbell (who first thought about creating a 3D visualization of a webpage). Everything started initially as a Google Summer of Code project, but now, with an enthusiastic team behind it and so many new features and ideas, it has become an active Developer Tools project.
Torbutton provides a button to easily enable or disable the browser's use of Tor.
praktische FF-extension für twitter, kann schnell zwischen accounts wechseln
Mit dem Kickstarter eine Extension erstellen
