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Back to close
This add-on makes it so that if there are no pages to go back to, the back button will close out whatever page you're on. This would be useful if it weren't so darn easy to close out an open tab by middle clicking it on your mouse button, or hitting the close button on the top of each tab. That, and if you're a bit too click happy going backward, you end up closing out the page you're on.
Photo credit: Mozilla