Domaintools.com's whois service maybe is the best whois resource on the net. This small (only 5Kb) Firefox extension just adds button to your browser for easy access to current opened site's whois source. I hope you to enjoy this extension.

Update: 03/01/2007 - Version 1.4. Opens the results in new tab. Thanks to Online Saratoga @ www.onlinesaratoga.com

Update: 06/18/2008 - Version 1.6. Firefox 3.0 compatibility update

Todo: add preferences menu to select opening whois details page: in new tab, in new window, in current tab

Download/Instal: Click here or go to Mozilla's extension page