If you've ever tried to create or edit a Web page, you know that getting the little details just right can sometimes take a long time. Here are a few Firefox extensions you can add to your toolbox that will help you measure images, align objects on your page, and capture colors quickly and easily.
When you need to know the exact size of your sidebars, headers, and other images in a flash, MeasureIt can tell you. MeasureIt adds a small ruler icon on the left side of the status bar. Clicking on the icon brings up a crosshair cursor; simply move the cursor to the object you want to measure, and drag a box over it. The extension will display the width and height of that object in pixels on the right of the drawn box. To get out of MeasureIt, press the Escape key; the page will turn back to normal.