Does exactly what it's supposed to Rated 5 out of 5 stars
Namely, "New tab, Paste, Go". Very handy.
To answer a couple of earlier comments, this add-on works fine for me in Firefox 3.6.3. Also, it does open a new tab automatically and loads the URL from the clipboard, all in one click. In Opera you click in the address bar, here you click in the tab bar -- you get used to it.