To the developer:
In outlook.com, if you read an email whose bottom part you have to scroll down, using this addon Page Screenshot, it will screenshot the whole VISIBLE AREA but not the NOT VISIBLE PART that is seen only when you scroll down your email.
What I wanted was an addon that would allow me to get a screenshot in jpg or pdf of not only the visible part of the email but especially also the not visible part of the email that is accessible only when you scroll down to see it.

Therefore, I cannot use this addon because it does not do what its title says "Full Web Page Screenshots". The title should be "Screenshot of Only the visible part of the Web Page".