17 essential browser tools for Web developers

What are the most useful in-browser tools for Web designers and developers? Here's what the pros recommend.
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Firebug

An oldie but a goodie, Firebug for Firefox (also available as bookmarklet for other browsers) displays page code in two windows containing the HTML (lower left) and the CSS data (lower right), allowing users to alter the HTML or try out different styles on the fly.

See details and download info for Firebug.

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