Warning: Downgrading to an older version can cause loss of Firefox user data, as well as performance and security issues. We advise against downgrading so please do so at your own risk. If you must use an older version of Firefox, please a separate for the older version, 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 personal 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. 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 Such software may not be essential for your security, but if outdated, it may interfere with the use of Firefox, or cause Firefox to crash.I still want to downgrade — where can I get the previous version?Although Mozilla has a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. 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 and choose Options. Preferences.In the General panel, go to the Firefox Updates section. Downgrade alternativesInstead of downgrading to an older, insecure version of Firefox and changing your update settings, you should consider these alternatives:Install Firefox Extended Support Release. Is an official version of Firefox developed for large organizations like universities and businesses.
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Firefox ESR does not come with the latest features but it has the latest security and stability fixes. For more information, see the article.Use the latest version of another browser.