Companion.JS

(pronounced Companion dot JS or CJS) is a Javascript debugger for IE. The current version is 0.5.3.
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 need to have a Microsoft script debugger installed. There are many cases where you already have this component install. To check if you need it see Installing Companion.JS for details.

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...

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Console API feature