tldr; Firefox changed the order in which suggestions appear when you start typing in the address bar. It used to show previously visited websites first. Now it prioritizes its own suggestions.
To get back to the old behaviour, navigate to about:config, search for the key browser.urlbar.showSearchSuggestionsFirst and change the value to false.
Not normal for me but I recently opted in to Firefox’s telemetry so they could see all the trouble I’m going through to turn off their new features in their reporting.
Will it change their mind? Probably not. But at least it’ll be there in the numbers