Download, install and migration

Firefox versions and languages

  • Firefox 3.6 is no longer supported Firefox 3.6 won't be updated with security and stability fixes. Keep your computer safe and install the latest Firefox if possible. We'll go over your options.
  • Find what version of Firefox you are using This article shows you how to find what version of Firefox you have to help you troubleshoot a problem or just so you'll know if it's up to date.
  • Firefox no longer works with some versions of Windows XP Firefox 3.6.28 and Firefox 12 are the last versions of Firefox that will work with the original version of Windows XP and Windows XP Service Pack 1. They won't be updated with security and stability fixes. In order to keep your computer and personal information safe, we recommend that you upgrade for free to Windows XP Service Pack 3 and install the latest Firefox. This article goes over your upgrade options.
  • What is the Mozilla Maintenance Service? Firefox now installs an optional service called the Mozilla Maintenance Service. This service allows Firefox to install updates without requiring you to click yes in the Windows User Account Control (UAC) dialog.
  • Install an older version of Firefox Downgrading usually doesn't solve Firefox problems. This article gives you links to old versions of Firefox and some alternatives to downgrading.
  • Firefox no longer works with Mac OS X 10.4 or PowerPC processors Firefox 3.6.28 is the last Firefox version to work on Mac OS X 10.4 or on Mac OS X 10.5 with a PowerPC Mac. Switch to a newer computer to stay safe online.
  • Firefox no longer works with Windows 2000 Firefox 3.6.28 and Firefox 12 are the last versions of Firefox that work with Windows 2000. They won't be updated with security and stability fixes. In order to keep your computer and personal information safe, we recommend that you upgrade Windows and install the latest Firefox if possible. This article goes over your upgrade options.
  • Common questions after upgrading from Firefox 3.6 Just updated from an old version of Firefox and wondering about all the things that have changed? This article covers the most common questions people have after upgrading and has tons of links to other great articles that you might want to explore later.
  • Firefox no longer works with Mac OS X 10.5 Firefox 16 is the last version of Firefox that works on Mac OS X 10.5 (Leopard). To stay safe online, we recommend upgrading your computer or operating system.
  • Common questions after updating to the new Firefox Just updated to the latest version Firefox and wondering about all the things that have changed? This article covers the most common questions.