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I have installed caffeine on fedora 25 through the following link
But, the last part that says:
I do not know how to enable the extension. Any help is greatly appreciated.
I think what they're talking about is to enable it in the Gnome Shell Extension Preferences as you see on that GitHub web page. Not sure about "restart the shell", to me that is restart Gnome which may be best done by a reboot of the system if that's the most convenient option. Sure you can kill the X server where it will restart or stop and restart Gnome, but if those actions are things you're not well versed in, then just perform a reboot.
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