Rated 5 out of 5 stars

Από τον/την mark84 στις Σεπτ. 12, 2010 · μόνιμος σύνδεσμος

For those wanting an updated version of this, someone has made an updated version called "Duplicate this tab".

Just a straight code copy but with latest browser support.
Link: https://addons.mozilla.org/en-US/firefox/addon/156490/