thanks- Not sure though why there is no option to upgrade it? Seems a bit odd- should be an option to turn it off or on-
If you have a question about Firefox, there are two solutions. First, you can do a internet search such as "prevent Firefox updates"
Second, you should have near the top of your bookmarks, a folder called "Mozilla Firefox." Click on it an you will see several choices. One of those is "Help and Tutorials." Click on it and you will see "Search Mozilla Support" and "Ask a question." Under Search, type "prevent Firefox updates."
Or if you want to learn how to go back to an older version type "older versions"
Could this have been made more obvious and simple? Yes, but that can be said about many things.
Once you know these "tricks" you can get answers to your Firefox questions.
One question a lot of us have is, "Why can we modify some things in its layout, but you won't let us change some other things."
BTW, there are add-ons available to change the layout of the controls found at the top of Firefox if you want.
Hope this is helpful now and in the future!