I absolutly love the JavaScript Console in Firefox and with the release of Firefox 1.5, it got even better. Now the standard JS console displays not only great JavaScript error messages, but it now show you CSS errors! The only problem is that with so much information appearing in the console, it can be difficult to find the errors you are looking for. Enter Console². It is a Firefox extension that adds some great filtering options for the console like showing only JavaScript, CSS or XML errors and filtering the source of errors like on the page you are viewing (content) or errors in the Firefox UI (chrome).
Next Generation JavaScript Console
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