Install an older version of Firefox

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  • Creator: Roland Tanglao
  • Comment: no need to mention test versions of nightly or bet as per Alice
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  • Reviewed by: rtanglao
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Downgrading to an older version of Firefox will cause data loss, and performance and security issues. We advise against downgrading so please do so at your own risk.

Downgrading is for advanced users only: If you must use an older version of Firefox, please use separate Firefox profiles with these older versions to minimize data loss.

Often when there is a problem with a Firefox update, people look for a way to go back to the previous version. That usually doesn't solve the problem and will make your computer and information vulnerable to attack. This article gives you some alternatives to downgrading and links to old versions of Firefox if you do choose to downgrade.

Installing a previous version doesn't fix most problems

Problems with an update are generally not caused by the new version of Firefox, but rather the update process. Installing a previous version will not help in most cases. Instead, see:

Note: Other problems can be solved with the Refresh Firefox feature. It restores Firefox to its default state while saving your essential information.

Ensure all security and security related software is fully updated. Some security software will need to be upgraded to a new version for each Firefox version update.

Optional software bundled with security software may also need updating. Such software may not be essential for your security, but if outdated, it may interfere with the use of Firefox, or cause Firefox to crash.

I still want to downgrade — where can I get the previous version?

Although Mozilla has a website with old versions of Firefox for testing purposes, it is not recommended that you use anything but the latest version.
Warning: Using old versions of Firefox poses a significant security risk.

By default, different versions of Firefox will use the same user profile data. Installing an older version of Firefox after using Firefox version 55 or above can cause problems such as error messages, breakage in portions of Firefox and issues with some websites. You should either create a new profile or else refresh Firefox after installing the older version.
Important: By default, Firefox is set for automatic updates. To prevent Firefox from automatically updating itself after you install an older version, you'll need to change your Firefox update settings: Click the menu button New Fx Menu Fx57Menu and choose Options.Preferences. In the General panel, go to the Firefox Updates section. (In Firefox version 55 and below, you would go to the Advanced panel and choose the Update tab.)Go to the Advanced panel and choose the Update tab (see this article for details).

Downgrade alternatives

Instead of downgrading to an older, insecure version of Firefox and changing your update settings, you should consider these alternatives:

Install Firefox Extended Support Release. Firefox Extended Support Release (ESR) is an official version of Firefox developed for large organizations like universities and businesses. Firefox ESR does not come with the latest features but it has the latest security and stability fixes. For more information, see the article Switch to Firefox Extended Support Release (ESR) for personal use.

Use the latest version of another browser:

Help us make Firefox better

If the latest version of Firefox is causing problems for you or you just don't like something about it, please give us feedback about it here: