I want to get a extension, which can do,
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Put a button on toolbar,
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After click the button, I can select any Elements (a div, or a table, and so on) by clicking it.
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After I select a button, display a layer, which display the element I just select in it, and the screen is masked with grey.
Basically, what I want is an extension which can capture a part of the screen, and then I can save it to my WordPress.
Mozilla FireBug