Bespin : The Online Code Editor from Mozilla Labs
Say hello to Bespin from the house of Mozilla.
It is an online code editor and much more.
I can easily say that this is one of the best innovative ideas I have seen in some time.
Check out the screen cast from the developers
Gran Paradiso : Firefox 3

Gran Paradiso Alpha 1 is an early developer milestone for the next major version of Firefox that is being built on top of the next generation of Mozilla’s layout engine, Gecko 1.9. Gran Paradiso Alpha 1 is being made available for testing purposes only, and is intended for web application developers and testing community.
Gecko 1.9 Alpha 1 introduces several new features which can be tested by using Gran Paradiso Alpha 1:
- Cairo is now being used as the default graphics library, affecting all graphic and text rendering
- Cocoa Widgets are now used in OS X builds
- An updated threading model
- Changes to how DOM events are dispatched (see bug 234455)
- Changes to how <object> elements are loaded (see bug 1156)
- Changes to how web pages are painted
- New SVG elements and filters, and improved SVG specification compliance
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