Definitely, tab bar is a must for tablets. Navigating tabs from a secondary tap-to-open screen is not convenient on big screens. All other major browsers support a tab bar - Chrome, Opera, Vivaldi, Edge, Brave, Samsung Internet, etc.
A really desired feature that could be activated in settings. On a large tablet I use another browser and the only reason I avoid Firefox is the crippled tab management. A tab bar with a plus (add new tab) button would be a much much appreciated feat...
