Essential Gnome Extensions
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Alt-Tab Switcher Popup Delay Removal - https://extensions.gnome.org/extension/1317/alt-tab-switcher-popup-delay-removal/
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Alternate Tab - https://extensions.gnome.org/extension/15/alternatetab/
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Launch New Instance - https://extensions.gnome.org/extension/600/launch-new-instance/
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Remove the title bar with Pixel Saver - https://extensions.gnome.org/extension/723/pixel-saver/