As someone mentioned before, it doesn't capture a selected area with Adblock Plus enabled (or in my case uBlock Origin). However, disable uBlock Origin and it works fine. Simple, easy and best of all, unlike Fireshot and most other screenshot add-ons, it has a print preview, where you can resize the image. Print Edit WE is nice, but only allows you to select elements. Screengrab! for some reason won't resize some images in the print screen (not sure if it's the size of the image, or that it crosses elements, or ?). I don't have the native Firefox Screenshots in 61.0.2, but with that tool, it's much more awkward, and you have to do extra steps (download) to get the print preview. If you just want to Capture and Print (but not edit or save) this a a good one.