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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.
Its all about aesthetics anyway. I kinda like them rounded off when I use tiling (with the extension tiling assistent, and a ~12px margin between each other and the border)