One of the best tools for making websites is the Web Developer toolbar for Firefox. If you have any hand in designing websites, this extension is a must have.

The Web Developer toolbar allows you to turn off/on images, CSS, javascript, etc. It’s especially handy for dealing with your friends’ horrid MySpace pages. You download the Firefox extension here.

Internet Explorer users can grab the MSDN Web Developer version of the toolbar. This has all of the same important features of the Firefox extension. Infact, it has a nice little DOM explorer that the Firefox version is lacking.

This isn’t the only web dev extension I use, but it is by far the most useful.