aka If I wanted to search I would have tapped in the address bar.
Firefox 137 for Android now automatically opens the keyboard when closing a tab and returning to the homepage. This hides all the recently visited sites and requires another tap on some empty space just to close the keyboard.
I use the recently visited section most of the time when using Firefox on mobile and very rarely type an address or search from the address bar so this recent change breaks the experience I have got used to over the last few years of using the app.