How can I make a screenshot of a web page that scrolls off the screen? 

Web Browser Based 
 
 Super Screenshot — Captures a web page. Choose if it has to grab the full page (including the lower parts) or the top screen only 
 Firefox Add-ons 
 
 
 Fireshot – Windows only, and I’m looking for an OS/X solution. I didn’t know Firefox add-ons could be OS specific. 	 
 Screen Capture Elite – Version 1.0.0.12 – the capture full page doesn’t seem to work on frames, but if you make the internal frame its own page it captured the full page. Works on OS/X. Has several options including save to clipboard. 	 
 Screengrab also appears to work on OS/X. It doesn’t have Save to clipboard option. 
 
 Standalone 
 
 SnagIt for Windows ($49) is an all-around solid screen grabbing program 
 
 Duck Capture For Windows Only (Free)