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The Middle Mouse Button 1.00.1-signed.1-signed Requires Restart
This is a very simple Firefox extension that will allow you to use the middle mouse button as a Go Back button. At the end of the browser history, it can also close the current tab.
About this Add-on
Note: Some mouse drivers will set the middle mouse button to act as something else by default. You will need to disable that feature if you want to use this extension.