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Companion.JS (pronounced Companion dot JS or CJS) is a Javascript debugger for IE. The current version is 0.4.1.
Companion.JS adds the following features to IE :

• Detailled javascript error reporting (call stack and real file name where the error occured).
• "Firebug"-like Console API feature.
• Javascript console feature useful to inspect javascript objects at runtime.
• A toolbar icon to open the Companion.JS panel.

To be able to use Companion.JS you'll also need to install Microsoft Script Debugger. See Installing Companion.JS for details.

The version 0.4.1 improves "console" object.

Here are some screenshots :

Detailled Error reporting

In the top-left corner the notifying panel which pops-up when an error occurs in the current page if the Companion.JS panel is not open. At the bottom of the page...

Console API feature

Companion.JS version 0.4.1 will expire on January 2009. Meanwhile new versions will be released so you will be able to upgrade with more recent version.