Use the latest version of another browser. For more information, see the article Switch to Firefox Extended Support Release (ESR) for personal use. Firefox ESR does not come with the latest features but it does have the latest security and stability fixes. Firefox Extended Support Release (ESR) is an official version of Firefox developed for large organizations, such as universities and businesses, but it can also be used for personal computers.
Install Firefox Extended Support Release. Instead of downgrading to an older, insecure version of Firefox and changing your update settings, you should consider these alternatives: In the General panel, go to the Firefox Updates section. Click the menu button and select Settings. So click on 65.0 folder or later versions folders on above mentioned FTP link and then select your operating system and locale and then you’ll be able to download Mozilla Firefox MSI installer as shown in. The MSI installers are available for Firefox 65.0 and later versions only. To prevent Firefox from automatically updating itself after you install an older version, you'll need to change your Firefox update settings: In the Menu bar at the top of the screen, click Firefox and select Preferences. Download Mozilla Firefox MSI Installer from Mozilla FTP. Important: By default, Firefox is set for automatic updates.