Based on Gina Trapani's About This Site Firefox Plugin (https://addons.mozilla.org/en-US/firefox/addon/3673), Passive Recon allows Information Security professionals the ability to perform "packetless" discovery of target resources utilising publicly available information. In addition multiple googlehacks can be performed. Selecting the ShowAll option at the bottom opens each search in a separate tab (Better have broadband, that's a lot of tabs and your browser will get very clouded).
Recommended to be included in FireCat, (available from Security-database.com)
Need to register with Firefox plug-ins site
Download and select install within Firefox
Right click, select passive recon