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Dim Inactive Windows to Help Focus Using a GNOME Extension
(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.
If your eyesight isn't great, the current contrast difference between active and inactive windows may not be enough