Firefox is no longer supported on Windows 8.1 and below.
Please download Firefox ESR (Extended Support Release) to use Firefox.
Download Firefox ESR 64-bit
Download Firefox ESR 32-bit
Firefox is no longer supported on macOS 10.14 and below.
Get the not-for-profit-backed browser on Windows, Mac or Linux.
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Read about new Firefox features and ways to stay safe online.
Get the details on the latest Firefox updates.
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See if your email has appeared in a company’s data breach.
Help prevent Facebook from collecting your data outside their site.
Save and discover the best stories from across the web.
Get protection beyond your browser, on all your devices.
Sign up for new accounts without handing over your email address.
New features and tools for a customized MDN experience
Use AI to detect fake reviews and scams
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Learn about the values and principles that guide our mission.
Meet the not-for-profit behind Firefox that stands for a better web.
Meet the team that’s building technology for a better internet.
Join the fight for a healthy internet.
Work for a mission-driven organization that makes people-first products.
Learn about Mozilla and the issues that matter to us.
Find out how we’re making the internet more inclusive and sustainable
More About Mozilla
Get the Firefox browser built just for developers.
Check out the home for web developer resources.
Discover ways to bring bright ideas to life.
Donate your voice so the future of the web can hear everyone.
Firefox Quantum was a revolution in Firefox development. In 2017, we created a new, lightning fast browser that constantly improves. Firefox Quantum is the Firefox Browser.
Learn more about Firefox Quantum
Firefox doesn’t spy on you online. We stop many known third-party tracking cookies and give you full control.
Get speed and security. Firefox is fast because we don’t track your moves.
Find out about all the amazing Firefox features.