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Alt-PrtScrn to copy only the active window.
If you want to just grab part of a webpage, reduce the size of the window, then hold down the Alt key and press the PrtScrn key. I also set up my Paint program so that I can open it with Ctrl+Alt+P (Put a shortcut to Paint on your desktop, and in the Properties, put in whatever hot key you want). So it's super easy and fast and free. Don't know why anyone with an Windows OS would want to go to the hassle of an add-on