Colorzilla is a very useful add-on for Firefox and a must for web designers. Earlier I was using Instant Eyedropper for figuring out the color code on any page but this tool goes above and beyond that.

What does Colorzilla do?

Besides giving me the color code for any point in the browser window, it lets me zoom the page I am viewing and measure distances between any two points on the page. The built-in palette browser allows choosing colors from pre-defined color sets and saving the most used colors in custom palettes. DOM spying features allow getting various information about DOM elements quickly and easily.

How does it work?

To activate it, click on the dropper icon in the statusbar and then move around the cursor on the page. As you move along you get the color code of that point, its x and y coordinate and tons of useful information (DOM path etc.). It also highlights the container as you move along on the web

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