Upgrade to a Better Browser

Make the switch to Firefox – the faster, safer, smarter way to browse the Web.

  Firefox 3.5 downloads Learn More

Faster, Safer, Smarter, Better

The Fastest Firefox Yet

Things move quickly online, and we’ve beefed up the engine that runs Firefox to make sure you can keep up: Firefox 3.5 is more than twice as fast as Firefox 3, and ten times as fast as Firefox 2.* As a result, Web applications like email, photo sites and your favorite social networks will feel snappier and more responsive.

Firefox Performance: Fast — Faster — Fastest

Results of a SunSpider test on a Windows XP machine

Firefox 2, Firefox 3, Firefox 3.5 performance chart
  • 18,148 ms
  • 3,669 ms
  • 1,524 ms!

View all performance features.
Learn more about Firefox 3.5’s performance upgrades.

* Based on the results of a SunSpider test of JavaScript performance on a Windows XP machine.

More Ways to Keep You Safe

Keeping you safe while you surf is our top priority, which is why we’ve upgraded our anti-phishing and anti-malware technologies and have added private browsing and “forget this site” options to ensure your privacy.

Plus, our open source security process means we have experts around the globe working around the clock to keep you (and your personal information) safe.

View all security features.
Learn more about Firefox security.

Anti-malware and anti-phishing

One Size Doesn’t Fit All

Everybody uses the Web differently, so why should your browser be exactly like the next guy’s? Whether you’re into chatting, cooking or coding, Firefox has more than 6,000 add-ons to help you customize it to fit your exact needs.

View all customization features.
Learn more about Firefox customization.

Add-ons Manager

Advancing the Web

We’ve been working hard to make sure Firefox 3.5 brings you the best of the modern web. With new features like private browsing, tear-off tabs and enhancements to the Awesome Bar, plus major performance enhancements, you’ll enjoy life on the cutting edge.

View the top new features.

Private Browsing

Making the Web Better

We believe the Internet is a public resource that must remain open and accessible to all. As public benefit software, every Firefox download supports the Mozilla mission of encouraging choice, innovation and opportunity on the Web.

Learn more about the Mozilla Foundation.

Take a Tour of Firefox 3.5 Watch the Video


Firefox is great, but don’t just take our word for it:

See the Awards

Tips & Tricks

Get handy hints for beginning, intermediate or advanced Firefox users.

Learn Some New Secrets