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‘:
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.
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