I understand your frustration with the recent Firefox update. To revert to the previous version, you can try uninstalling the current version from your computer. After that, you can download the older version of Firefox from Mozilla's website and install it. However, keep in mind that using an older version may have security risks, so it's important to ensure your system's safety. If you're not comfortable doing this yourself, please let me know for assistance. Hopefully, this helps you get back to a version of Firefox that you're comfortable with and resolves the issues you're facing.