Firefox keeps you secure when you're browsing the Web, closing the door on spyware, worms, and viruses.
Firefox contains a built-in Phishing Protection feature that warns you of suspected Web forgeries, and offers to take you directly to a search page so you can find the real Web site you were looking for.
The Firefox community of developers and security experts works around the clock to monitor security issues and release updates to better protect you.
Firefox use tabbed browsing to open multiple Web pages in a single browser window, and quickly flip back and forth. Drag and drop open tabs to keep related pages together.
Firefox's built-in pop-up blocker has been enhanced to block more unwanted pop-up and pop-under ads.
Firefox is a browser respecting ultimate standards of the Web.
Firefox is a free software, which wants to say that on the one hand it is free, and that on the other hand its receipt of manufacture ("source code") is available and can be re-used by other projects or be improved by people not working for Mozilla Corporation.
Firefox is multiplateform, it exists for Windows, Mac and Linux. Its nature of free software made it possible other developers to make of them versions for very exotic platforms such as BeOS or SkyOS.