Rated 4 out of 5 stars

I'll reply to my own comment below:

The current version of Paste and Go ( https://addons.mozilla.org/en-US/firefox/addon/9133/ ) already does that, if you configure it properly. It can either paste and go to a blank tab, or to a new tab. So it fulfills both functions.

This review is for a previous version of the add-on (0.3.1).