I also don't like the UI, but it's only a default. After installing, right click anywhere on the top UI to pull up "Customize...", then in the tab that appears,

I also don't like the UI, but it's only a default. After installing, right click anywhere on the top UI to pull up "Customize...", then in the tab that appears, select "Density" and change it from Normal to "Compact". The compact UI has back/forward buttons being the same size. The UI also takes up less space and is generally nicer IMO