Firefox 3 has been out for two weeks now, so get with the program: It's time to hack it. The newest version of Mozilla's browser has plenty of new features, including the site identification button, the Bookmarks Library and what has become known as the "Awesome Bar" -- and I'll show you how to hack them all.

You can also force the browser to use Gmail for mailto: links, discover a hidden "Easter egg" and more. So fire up your browser and get ready to teach it some new tricks.

A note before we begin: One of the best ways to hack Firefox 3 is via about:config, which lets you change a wide variety of Firefox settings and preferences. Many of the hacks in this story make use of this nifty and practical utility.

To use about:config, you'll always repeat a few basic steps:

1. In the address bar, type about:config and press Enter.

2. A message will appear reading "This might void your warranty!" Ignore that nonsensical warning and click "I'll be careful, I promise!"

3. In the filter box, type the name of the setting you want to adjust. You'll see that entry appear in the area below. (If the name of the setting is very long, typing the first part of it will generate a list; you can then pick the setting you want.)

4. Make changes to the setting as instructed.

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