How about the power to customize every goddamn aspect of the UI? The power to make my browser behave the way I want it to behave? This is what made Firefox wort

How about the power to customize every goddamn aspect of the UI? The power to make my browser behave the way I want it to behave? This is what made Firefox worth the while for thirteen, fourteen years or however long it's been. I really have no idea where to go from here.