IE8 Developer Tools and console

GMail is severely degraded when running Firebug 1.2.0b6 (for Firefox 3). It's much more confusing as to how to disable Firebug completely for particular domains. I'm using Google Apps for domains, and editing a mail message is just about unusable if I have Firebug enabled in the browser.

Firebug-clone for IE (from Microsoft)

Quoted: The Microsoft Internet Explorer Developer Toolbar provides a variety of tools for quickly creating, understanding, and troubleshooting Web pages.

Joe cleverly build a proxy server to get FireBug debugging on an iPhone. Pretty amazing.

Drip - an IE memory leak detector.

Extensive article on IE memory leaks including circular references between JavaScript objects and the DOM, as well as cicular references via closures.

You have to use the Browse With command to make IE the default browser to make sure the IE script debugging works.

Quoted: ASP.NET, Visual Studio, ASP.NET 2.0, .NET

IE Javascript debugging is in a storry state. Best tool is the (free) Visual Web Developer 2005 Express Edition.

But you have to make sure IE is the default browser that VWD uses via the Browse With context menu (the only way to attach the debugger process is have VWD open IE for you; you cannot attach a debugger after the fact with this solution).

Firebug is far and away the debugger of choice for client-side JavaScript.

Overview of FireBug by Joe Hewitt.