Rated 4 out of 5 stars
While the "screenshoter" spelling made me sceptic first, that extension worked well for me, across some firefox installations on different systems, and across some firefox updates now.
It saved portions, or the whole browser window always exactly as expected.
And why not a maximum rating ?
Because it fills the valuable space beside the address field with a useless black camera icon.
I'd really appreciate that icon to be removed.