Examine source code of Subtle Stripes 2

{
  "theme": {
    "images": {
      "theme_frame": "Firefox-header.png"
    },
    "colors": {
      "frame": "#d1d1d1",
      "tab_background_text": "#000000"
    }
  },
  "version": "2.0",
  "name": "Subtle Stripes 2",
  "manifest_version": 2,
  "description": "An update of the original Subtle Stripes design. Added appropriately subtle highlights. Enjoy!"
}