Welcome to SeaMonkey Add-ons.
Add extra features and styles to make SeaMonkey your own.Close
Ammend to my comment 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.