Rated 5 out of 5 stars

I love screengrab! I just upgraded to FF 4.0b8 and it was not working... I used a trick-fix from mozillazine:http://kb.mozillazine.org/Editing_an_add-on_to_change_its_compatibilityand it works :)

Update: This doesn't work well... it only seems to save short screens and nothing with videos. Was worth a try, though :)