Install an older version of Firefox

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This article describes how to install a previous version of Firefox, a process also known as "downgrading". For instructions on how to install a newer version, see Update Firefox to the latest release.

Why install a previous version?

Problems after upgrading Firefox are generally not caused by the new version itself, but rather the upgrade process. Installing a previous version will not help for most problems. Some common issues include:

Other problems can be solved by creating a new profile.

If you still want to downgrade to a previous version, you can do so by downloading and running a previous version's installer.

Installing the previous major version

The latest update to the previous major version of Firefox is available here.

Installing any previous version

Previous versions of Firefox have public security problems. You could be exposed to viruses, phishing, and other attacks by running old versions.

To find a previous version:

  1. Go to the Mozilla FTP server.
  2. Choose the version you want.
  3. Choose the win32/mac/linux-1686/ folder
  4. Choose your language. en-US is US English.
  5. Choose the file that does not end in .asc. The download will then start.
  6. Once the file is downloaded, install it.

After downgrading, if you intend to stay with that version, you will need to disable automatic updating. It is highly recommended that you try new versions of Firefox as they're released to see if they solve your problem.