Firefox 3 was released just this June, and many Firefox fans believe the new version is clearly the best browser you can get. You can make it even better with free add-ons, which integrate directly into the browser and offer loads of useful new features.

Want to increase your security and privacy, synchronize bookmarks among multiple PCs, dress up Firefox tabs, juice up Google, and more? Then I've got the add-ons you need. These 15 great downloads make the world's best browser even better--and, like Firefox itself, they're free.

Foxmarks Bookmark Synchronizer

If you use Firefox on more than one PC, you most likely spend a lot of time trying to keep their bookmarks in synch, or else you've simply given up the attempt. Otherwise, every time you add, delete, or edit bookmarks on one PC, you have to remember to make the same changes on the others. Not a pretty picture.

The Foxmarks Bookmark Synchronizer solves the problem. Install this tool on each of your PCs, and then, with a click or two, you can synchronize any changes. In fact, you don't even need to click because you can set the program to synchronize automatically.

The utility offers other benefits as well. Your bookmarks are automatically backed up to a server, so if for some reason you lose them on your PCs, you can always restore them. You can also log into the Foxmarks Bookmark Synchronizer Web site and edit your bookmarks directly there. In addition, if you're using someone else's PC, you can use your bookmarks straight from the Foxmarks server.

Download Foxmarks Bookmark Synchronizer | Price: Free

Secure Login

If you often log into Web sites and forget or lose your password, Secure Login will be a great time-saver. It directly integrates with Firefox's password manager, and will log you into any Web site without you having to remember or look up the password. When you're on a page that requires a login, simply click the icon. Better yet, use a hot-key combination to log in faster.

The program also helps keep you safe online--it prevents hackers from stealing your passwords by halting malicious JavaScript code. It also protects against other password dangers, such as cross-site scripting (XSS) attacks.

Download Secure Login | Price: Free

BugMeNot

Registering with a Web site often means making a deal with the devil. You give the site information such as your name, e-mail address, and potentially more private data such as your mailing address, phone number, and age. But what happens with that information? You may be inundated by spam, your name may be sold to mailing lists and advertisers, and possibly worse. But for many Web sites, if you don't register, you can't log in and use the site.

This add-on solves the problem. Go to a Web site, right-click in the user name or

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