Third-parties & Developpers
Greasemonkey is a Mozilla Firefox extension that allows users to install scripts that make on-the-fly changes to most HTML-based web pages. Many netvibes-related scripts are listed in the UserScripts.org directory. However, please note that none of them are supported by Netvibes, and that the older ones might not work with recent releases of Netvibes - especially Ginger.
Greasemonkey Netvibes Scripts: http://userscripts.org/scripts/search?q=netvibes