How to prevent/close duplicate tabs in Safari?

Question

I have an extension for Firefox, "Close Repeated Tabs", and one for Chrome called "Tab Dupectomy"... but I really use Safari the most, and often have HUNDREDS of tabs open. I am desperate for a way to close, or ideally prevent from opening altogether - each tab that is for the SAME URL as another. I would imagine this is possible via an extension, script, etc.

PLEASE HELP!

Answer 1

Having had a quick look around safari extensions, the only thing I found was a tool named 'Sessions', this extension lets you manage your tabs and running safari sessions with ease, and it does indeed have a feature to remove duplicate tabs.

I found it here: http://dl.dropboxusercontent.com/u/8247646/sessions/index.html

Hope this helps!