The Paste and Go add-on is now compatible with all versions of Firefox. This useful add-on had stopped functioning earlier once users upgraded to Firefox 3.x. The developers have now addressed this issue and it is working fine with the latest versions of the browser.
The Paste and Go add-on for Firefox replicates the very useful built-in feature of Opera by the same name. It lets you paste any word or URL and run it in one smooth action, thus eliminating the need to do so using multiple mouse clicks or keyboard actions.
So if you had uninstalled the add-on earlier, go right back and reinstall it.