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 [[Updating Firefox]]. __TOC__ = 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: * [[Cannot connect after upgrading Firefox|Can't access websites anymore]] * [[Firefox cannot connect securely because the SSL protocol is disabled|"Firefox can't connect securely..." error]] * [[Add-ons are disabled after updating Firefox]] Other problems can be solved by [[Managing profiles#w_creating-a-profile|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 [http://www.mozilla.com/en-US/firefox/all-older.html here]. = Installing any previous version = {note}'''Previous versions of Firefox have public security problems. You could be exposed to viruses, phishing, and other attacks by running old versions.'''{/note} To find a previous version: # Go to the [ftp://ftp.mozilla.org/pub/mozilla.org/firefox/releases/ Mozilla FTP server]. # Choose the version you want. # Choose the win32, mac, or linux-i686 directory based on your operating system. # Choose your language. '''en-US''' is US English. # Choose the file that does ''not'' end in {filepath .asc}. The download will then start. # Once the file is downloaded, [[Installing Firefox|install it]]. After downgrading, if you intend to stay with that version, you will need to disable [[Updating Firefox#w_configuring-update-options|automatic updating]]. It is highly recommended that you try new versions of Firefox as they're released to see if they solve your problem.

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:

• Can't access websites anymore
• "Firefox can't connect securely..." error
• Re-enable add-ons that were disabled when updating Firefox

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

To find a previous version:

1. Go to the Mozilla FTP server.
2. Choose the version you want.
3. Choose the win32, mac, or linux-i686 directory based on your operating system.
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.