FireShot is just one of the neatest add-ons there is. It's like someone read my mind. Every time I take a screenshot if I want it cropped I have to edit it in another application. I stopped trying to do nifty things with my screenshots a long time ago because it was a pain. That's no longer the case with FireShot.
FireShot is a Firefox add-on that creates screenshots from right within your browser. To install it just download and activate it. Once activated all you need to do to use it is press the big red S in the corner of Firefox. FireShot allows users to create, edit, save and share screenshots, which can be saved as a png, jpeg, bmp or gif file. Look at all of the neat tools in the second picture! Now I can draw little arrows and stick notes all over my screenshots!