How do I disable the URL Drop down

I am NOT asking to remove content from the drop down - already done. I do not want the drop down to open - at all. On a Mac the drop down interferes with the normal entry user interface. The normal text interface is: type to move to first/last character use the up/down arrow. The dropdown interferes with this standard behavior. The up/down arrow will not move the cursor to the first/last character in the url - until/ or unless the user hits <esc> to close the dropdown. I have looked at the browser.urlbar preferences and do not see a setting that will change this behavior. Is there a way to do this, so that url entry is doen entirely in the url bar - and not in the drop down. (and before this is discussed - I do Not want to have Any type ahead/lookup done on the urls entered, and have already disabled all of these options, so there is no need for the dropdown). Thank you Mac OS X 10.13.6 FF 81.0