In few words, the Amazon Shopper Extension provides you an easy way to search for almost anything on Amazon.com 

To be nore exact, the Amazon Shopper Extension installs an Amazon search bar and a number of quick links to different Amazon pages, right under the browser's toolbar.

Here are some key features of "Amazon Shopper Extension":

· An Amazon search toolbar with convenient links. Click on the Amazon button to easily hide and show the toolbar.

Contextual Search:
· Right-click on any text in any web page and you will have the option to search for it on Amazon.com

Settings:
· Visit the extensions tab of the Safari preferences dialog and you can control if the search results open in a new tab (default) or the current tab

Requirements:

· Safari 5 or later