Rated 5 out of 5 stars

In my case, running FF 6.0.2 on Windows 7 32-bit, screengrab works on almost all (except a finite number of) sites, including full page capture and box-selected capture. I'm not suspecting anyone of crafting false testimony except a few claiming screengrab to be malware, but please do not invalidly generalize your case to reach an unsound evaluation of screengrab's quality. I'm simply providing a counterexample to disprove certain insane claims.