A Firefox extension (cross-platform) equivalent illustrated here tells the story.
The URL for carlo's Firefox extension is http://docs.g-blog.net/code/mozilla_extensions/#download
moregoogle blurb:
See page preview thumbnails cool!
'Open in New Window' Button
Live Amazon.com product information new!
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It's free :-) (as in 'free beer' and 'no spyware')"