When you open a new tab in Firefox 57, you see the search bar at the top, followed by the most visited, and finally with some highlighted sites.
There’s also an option to choose between a dark and light theme as well. At the bottom left you should see the option to add your photo. You can also decide how many tiles you want per row and how many columns. To add an image, click on the cog wheel on the upper-right corner.
