When a tool in the front page's list of tools has keyboard focus, it shows the same colour it shows when pointed at, with a soft ring inside its edge. This also applies when your browser's find in page (Cmd+F or Ctrl+F) moves focus to a tool. Before, the browser drew a black border around the tool, which stayed there after you clicked it.
Focused tools on the front page match the page
A tool in the front page's list of tools shows its colour and a soft ring when focused, instead of the browser's black border.