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Nautilus Has a New Look in GNOME 45
(www.omglinux.com)
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.
Everything I use outside of gnome puts the back button in a common spot in the top-left corner of the given window. Why fix what isn't broken? That's gonna drive me nuts.