What is the best developer toolbar for IE?

I use 'FireBug' extension of FF to debug designed webpages and installed 'IE Developer Toolbar' for IE to get this purpose, but it is not as good as FireBug. It is difficult to work with it.

Are there any other extension for IE that are more开发者_如何学C user friendly and easy to use??

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There is Firebug Lite for IE too. Docs Here

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I use IE8's excellent built-in Developer Tools. Go to Tools > Developer Tools or just press F12.