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You can download Firefox 13 for Windows, Mac OS and Linux using the links which follow.
One of the features you will first notice is the new homepage which also includes quick access to shortcuts like downloads, add-ons, bookmarks, history, settings and synchronization options.
The frequently used tabs have also been redesigned and resembles Google's Chrome browser. The main window will show you a tiled view of previously visited pages along with a thumbnail of each site. This feature can currently be toggled on and off.
There are also some feature improvements for developers in the HTML Panel. Page Inspector and Style Editor.