Whilst you can customize the Firefox New Tab page with New Tab Tools, you can’t really add something completely new to it. Click Grid Spacing to expand or decrease the spacing between thumbnail tiles. To adjust the grid margin around the thumbnails, click the Grid Margin drop-down list and select option from there. You can also adjust grid margin and grid spacing. Click the Launcher drop-down list, and then select Top, Left or Right to move the launcher. However, you can adjust its position with New Tab Tools. The New Tab launcher, which includes various options, is at the bottom of the page by default.