Firefox 4 released

Firefox 4 is available to download for Windows, Mac OS X and Linux in more than 80 languages. Firefox 4 will also be available on Android and Maemo devices soon.

Firefox 4 is the fastest Firefox yet, between two and six times faster than previous releases.

Major enhancements to the JavaScript engine make everything from startup time to page load speed to graphics and JavaScript performance screaming fast in Firefox.

Firefox supports modern Web technologies, including HTML5.

Security and privacy

  • Do Not Track: Firefox is leading the Web towards a universal standard Do Not Track feature that allows users to opt-out of tracking used for behavioral advertising.
  • Firefox puts privacy first, fixing flaws in some Web standards to prevent others from accessing your browser history.
  • HTTP Strict Transport Security (HSTS): automatically establishes secure connections to stop “man in the middle” attacks and keep sensitive data safe from interception during the log-in process.
  • Content Security Policy (CSP): prevent cross-scripting attacks by allowing sites to explicitly tell the browser which content is legitimate.
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Firefox 4 released