Decent addon, but it could be _much_ better:


(1)
Disable animation and popup for faster performance - there are better ways to indicate progress without impacting performance which animation and popup does degrade performance.


(2)
Trying to screenshot in AMO, or most other browser-internal pages results in the following error message:
"This page is restricted and cannot be captured."

However, this is not truly the case, as Firefox's default, builtin screenshot tool "Control-Shift-S", actually _does_ allow capturing of AMO and most browser-internal pages.

So, this is clearly not a restriction that cannot be overcome, and so, this should not be a feature-restriction of this addon.


(3)
Add a feature to screenshot _all_ tabs in a window - much like the same feature offered by "Save Page We" and "SingleFile" addons.

This is a feature that fireshot provides, but this a proprietary extension and also requires an external helper application to do this work, and this is also a feature that the user needs to pay for by purchasing a Fireshot license.

So, this feature, if properly implemented, could truly distinguish this addon from other competitors - making it the best screenshoting tool for firefox.

It works great but the size of page that it will save is limited. To save longer pages you will need to reduce the zoom of the page.
For saving a screen size image it's ideal.
For example at %100 zoom on google images it saved down to 15 images. when changing the zoom to %50 it saved down to 37 images, those were very poor quality and the text unreadable.
The normal 'Save Entire Page' (going by how many images were shown on the normal screen size was four) is just short of X4 of the normal screen.
That's what I've found using it on Linux, I haven't used it on Windows so the performance may be better for Windows.
Update,
I still haven't found an easier or more reliable page saver, even when the page is too large to save as a single image, the page will be saved with two images.