1.5. Turning Firefox into a Development Machine

Firefox is an especially important browser for Web developers. It has a number of attractive features including its excellent standards support in HTML and JavaScript. However, the most important advantage of Firefox as a developer's tool might be its support for extensions. Many commercial browsers keep their code a closely guarded secret, and are very difficult to extend. Firefox was designed from the beginning to have its capabilities extended — and a number of very clever programmers have added incredible extensions to the tool. A few of these extensions have become "must haves" for Web developers:

1.5.1. Web Developer Toolbar

The Web Developer Toolbar by Chris Pederick is an incredible tool. It adds a new toolbar to Firefox with a number of extremely useful capabilities: