[superdaniel]

You can make the tab bar and url bar smaller by going to the menu > customize > density > compact.

[developer2]

Thank you so much. That change, combined with the switch to the Light theme, makes Firefox so incredibly better on macOS.

[awinder]

yeah this was such a huge step up, thanks so much. that circled back button was especially driving me nuts so that going away instantly improved my take on this :D

[jventura]

Thanks! By the way, for those who read this, to change the theme is menu > customize > theme.. These things are not easy to find!