Omnibug is a tool for web developers. I wrote it because debugging an Omniture implementation is… painful.
The idea is that web metrics (or webanalytics, if you’re so inclined) systems generally make an HTTP request (usually an image) in order to pass along tracking information. The URLs contain lots of parameters, conveniently URL-encoded so you can’t read them easily.
Omnibug is an extension to Firebug (without a doubt the best Firefox add-on available, driving a revolution in web UI development). It adds a new panel with the decoded output of each such HTTP request, making it a breeze to see exactly what values were sent.
Though it was designed with Omniture in mind, it will work with other systems (also tested with Moniforce). The patterns it looks for are fully configurable, so in theory it should work with any similar system.
An additional feature is the ability to log matching requests to the local filesystem. While this feature was intended to support automated testing of metrics implementations, it may have other uses.
See the Omnibug page for downloads and full documentation.