Examine source code of Cute Squirrel

{
  "theme": {
    "images": {
      "theme_frame": "_firefox.persona_eichhrnchen_header_01.jpg"
    },
    "colors": {
      "frame": "#b5b1b1",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Cute Squirrel",
  "manifest_version": 2,
  "description": "Squirrel are sooo cute!"
}