Here’s a handy browser extension to add to your toolbox: FireShot, an add-on that captures entire webpage screenshots – even scrollable areas.
Install FireShot in just a few seconds, then screenshot any website just by clicking the “S” icon in the top right corner of your browser and selecting an option:
Once you click an option, there will be a short pause, and a new tab will open up, allowing you to work with your screenshot: edit, save to various formats, add text annotations, share, copy to clickboard, print, etc.
The first time I saved an image, I was prompted to allow FireShot to manage my downloads. Then a “Save As” prompt appeared where I could chose the name and destination to save my screenshot. Here’s what the output looks like (click to see a larger version):