Omnibug is a plugin for Firebug to ease developing web metrics implementations. Each outgoing request (sent by the browser) is checked for a pattern; if a match occurs, the URL is displayed in a Firebug panel, and decoded to show the details of the request. In addition, requests can be logged to the filesystem. Out of the "box", it supports Omniture, WebTrends, Google Analytics/Urchin and Moniforce. Custom matching rules can be defined to support other systems.