Examine source code of Pusheen laptop

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Pusheen laptop",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png",
        "images/1.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right top",
        "right top"
      ],
      "additional_backgrounds_tiling": [
        "no-repeat",
        "no-repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(248, 237, 236)",
      "toolbar_text": "rgb(176, 156, 156)",
      "frame": "rgb(243, 223, 223)",
      "tab_background_text": "rgb(14, 12, 12)",
      "toolbar_field": "rgb(255, 255, 255)",
      "toolbar_field_text": "rgb(13, 11, 11)",
      "tab_line": "rgb(206, 156, 154)",
      "popup": "rgb(248, 237, 236)",
      "popup_text": "rgb(200, 167, 166)",
      "tab_loading": "rgb(206, 156, 154)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{500ada25-fc5c-4522-9884-bbb61cd3dc9f}"
    }
  }
}