IntelliJ IDEA
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IntelliJ IDEA: Debugging JavaScript in Google Chrome
IntelliJ IDEA 10 allows you to debug JavaScript code running it in Mozilla Firefox. In IntelliJ IDEA 10.5 can choose to debug JavaScript in Google Chrome as well.
Debugger for Chrome supports all features of JavaScript debugger for Firefox, you can set breakpoints, inspect local variables, evaluate expressions and so on:
If you use Chrome for web browsing and want to debug in it simultaneously you can configure IntelliJ IDEA to use a separate Chrome user profile in ‘IDE Settings | Browser | Chrome‘:
To configure the default debugging browser just edit the ‘JavaScript Debug’ configuration under ‘Defaults’ section.
Download IntelliJ IDEA 10.5 EAP, try the new JS debugger and let us know what you think.
Off-topic: debugging JS in FireFox 4 is supported since IntelliJ IDEA 10.0.3.