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Companion.JS (pronounced Companion dot JS or CJS) is a Javascript debugger for IE. The current version is 0.2, adding 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.