at the very top of firefox browser are 3 rows...the highest row is the list of open tabs.....the middle row is the address bar itself with various icons....the lowest row which is the third row begins with 'import bookmarks' 'getting started' and then various website suggestions.

that 3rd row takes up space and has no useful functionality for me .....i've tried changing the settings but i can't alter it... is there a harmless way to eliminate that third row? thanks