If you design websites, you should be using Firefox. Here are the three essential Firefox extensions all web designers must have!

1. Web Developer
The Web Developer extension adds a menu and a toolbar to your Firefox packed with various web developer tools. It allows you to disable specific page elements, view styles, outline blocks, tables, and much more. This is the ultimate tool for web designers — a must have!

2. ColorZilla
Graphic designers will relate with me on this one - taking a screenshot of a web page, pasting in Photoshop, and grabbing a color from the page. No more! With ColorZilla you have an Advanced Eyedropper, ColorPicker, Page Zoomer and other colorful goodies for your Firefox.

3. Aardvark
Aardvark could be considered a companion to the Web Developer extension. It allows you to hide page elements, view block-specific information, and mouse-over source code.