TOOLS :
Screen capture apps:

1. Firefox Screen Capture add-on:
https://addons.mozilla.org/en-US/firefox/addon/5648

2. Windows Screen Capture:
If you don’t know how, read this …
On the standard Windows operating system, pressing the Print-Screen key will copy an image of the entire screen to the clipboard, holding the Alt key and pressing the Print-Screen key will capture the currently selected window. If you’re using Vista or Windows 7, it’s pre-installed with a screen capture utility called “Snipping” usually under the Start > All Programs  > Accessories menu.

On the PC there are also many freeware screen capture apps:  this site reviews many & includes download links
http://www.techsupportalert.com/best-free-screen-capture-utility.htm

3. Mac Screen Capture:
If you don’t know how, read this …
http://graphicssoft.about.com/od/screencapturemac/ht/macscreenshot.htm