Screen shot is one of the major item for the web developers. It helps to describe any kind of problem easily. Suppose we are having a problem with a alignment of a text in a web page. Then we can simply take the snap with Fire Shot and send it as an a reference of the issue. Problem description can also added with the text. Overall its a beautiful plugin for the web developers. Here are some small features that i feel with it:
Download and install it from here: http://screenshot-program.com/downloads.php
Firefox plugin link: http://screenshot-program.com/fireshot.xpi
Enjoyyyyyyyyyyy
You can take screen shot of visible area and also edit it by pressing - Ctrl + Alt + Z
Have a good day.