Hey DarkRaven574, There are a lot of benefits to running the latest version of Firefox. Why do you want to downgrade? If you are having an issue someone here might be able to help you. You might want to consider running the older version on [http://portableapps.com/apps/internet/firefox_portable/localization#legacy36 a USB Stick with PortableApps]. That way you'll still be able to run the latest version for your day to day activities. If you still want to roll back to a previous version of Firefox, just take a look at the Knowledge Base article [[Installing a previous version of Firefox]]. Hopefully this helps!