Good but could be great. - Does what it says. If there was an ability to hit F5 and refresh the image on the URL this would be perfect. As is ... having to re-enter the URL every time to refresh the image is big hassle. I need the ability to take screenshots of the same 6 pages up to 5 times a week.
Ghostblur (v1.10: ★★★ on Mac App Store)