Installation is a piece of cake, and you can find instructions in Chapter 20. After you install an extension, you can access the features it offers through the main Firefox interface as if they'd always been there. This chapter outlines la creme de la creme of the Firefox extensions. Because developers can update their extensions at any time, specific directions would soon be obsolete, so in this chapter I try to provide a general overview. Most extensions are very simple to use and offer their own help systems. Have fun! Before Getting Started Extensions are created by the extended community, not by the Firefox team itself. I don't tell you this to frighten you; the extensions available on the official Firefox Web site are used by plenty of people every day. My point is that the Firefox developers don't decide when to upgrade or stop distributing a given extension. This means that by the time you read this, some of the extensions I discuss here might have changed drastically, and others might not even be available anymore. I hope that isn't the case and will do my best to prevent that, but it's a possibility. I have three other notes before you get started: Check out Chapter 20 to familiarize yourself with the Firefox extension system before proceeding. That chapter explains where to find the extensions I discuss here, as well as how to install them. Remember that you need to restart Firefox after installing an extension! You can configure many extensions from the Options windows that you access through the Options button in the Extension Manager (Tools Extensions), as I describe in Chapter 20. Some extensions also put shortcuts to their options on the Tools menu. Many extensions quietly add buttons to the Customize Toolbar window. You can drag these buttons to your Firefox toolbars, as I explain in Chapter 18, to access the extension's features quickly.           Gaining Peace of Mind with SessionSaver Extension SessionSaver Categories Navigation, Tabbed Browsing Wash the dog, feed the kids, wash the kids, feed the kids to the dog - think about all the stuff you keep track of every day. Wouldn't it be great if you could just download your brain to a disk, enjoy some worry-free downtime, and reload it later? Technology still has a little ways to go, but the SessionSaver extension is the next best thing. As the name implies, SessionSaver remembers the state of Firefox from one browsing session to the next. For instance, if you open seven Web sites and then carelessly close Firefox, you see the same seven sites the next time you open it. The Web sites reopen in whatever form they were in when you closed Firefox. In other words, Web sites that were open in windows will reopen in windows, and Web sites that were open in tabs will reopen in tabs. SessionSaver even remembers information you've typed into Web forms but haven't yet saved or submitted. And the best part? You don't have to do anything to make this work. REMEMBER SessionSaver restores exactly what you had open in your previous session, so unless your home page was open last time, it won't load the next time you start Firefox. Thanks to SessionSaver, you no longer have to lose your open Web sites when your laptop battery dies or your spouse wants to go online. It also saves you from