Firebug is a very popular Firefox plugin. It's a web development tool that allows you to "edit, debug, and monitor CSS, HTML, and JavaScript live in any web page".

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What are some tools for testing Mobile web apps?

I'm thinking along the lines of a Firebug for the iPhone/iPad/Android/BB that can truly give more insight on the markup/scripts. Even when testing on the simulator/device, it's hard to truly simulate ...