MeasureIt for Firefox A simple to use addon for your Firefox browser.
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Firefox extension measure Pixel simple browser width browser addon

MeasureIt for Firefox Description

You can use MeasureIt for Firefox to easily draw out a ruler to get the pixel width and height of any elements on a website. When selected, MeasureIt adds a colored filter to your browser in order to separate the background from the measuring area and displays the height and width in pixels in an informational box. You can draw a measurement area by dragging the lower right corner of the frame with the pointer or use the key combinations for fine adjustment.

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