Safari Extensions
Click buttons on left to download

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     Close Tab
  A toolbar button that closes the active tab  

     Close Inactive Tabs
  A toolbar button that closes the inactive tabs in the current window. It includes an option to also close inactive windows.  

     Is.gd URL Compressor
  A toolbar button that shortens the active URL with the Is.gd service. It can send the compressed link in an email, display it in a popup box or both.  

     Stop Button
  A toolbar button that stops the page from loading  

     Amazon Search Button
  Adds a toolbar button for searching and purchasing from Amazon. A prompt appears and you can type your Amazon search in the box and hit enter or the ok button.                             
 

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notes:
Close Tab uses Apple's shared code from http://developer.apple.com/safari/library/samplecode/CloseTabSafariExtension/Introduction/Intro.html
Amazon button adds a small referal tag that may bring in a small amount of money to the author of the extension.
Want to add Safari Extensions' extensions to your safe open download list file extensions? Follow the information in this webpage and add .safariextz to the list http://www.manuelstuder.ch/2008/03/14/how-to-automatically-open-torrent-and-other-files-in-safari/