You get them even via you package manager or e.g. from https://extensions.gnome.org/ https://extensions.gnome.org/ What you can get out of one: e.g. caffeine,

You get them even via you package manager or e.g. from https://extensions.gnome.org/ https://extensions.gnome.org/ What you can get out of one: e.g. caffeine, without it the "screensaver" will blacken the window, which I do not want..... You cannot disable soem features in window manager or apps. The workaour ist to use a shell extensions or sometimes called applet.