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Firefox for Linux Adds Rounded Bottom Corners
(www.omgubuntu.co.uk)
The GNOME Project is a free and open source desktop and computing platform for open platforms like Linux that strives to be an easy and elegant way to use your computer. GNOME software is developed openly and ethically by both individual contributors and corporate partners, and is distributed under the GNU General Public License.
Less risk of poking a hole in the side of your monitor when you move the window around I suppose.