Examine source code of aesthetic rainbow smiley

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "aesthetic rainbow smiley",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right bottom"
      ],
      "additional_backgrounds_tiling": [
        "repeat-x"
      ]
    },
    "colors": {
      "toolbar": "rgb(235, 184, 221)",
      "toolbar_text": "rgb(0, 0, 0)",
      "frame": "rgb(242, 214, 208)",
      "tab_background_text": "rgb(247, 250, 163)",
      "toolbar_field": "rgb(0, 0, 0)",
      "toolbar_field_text": "rgb(83, 234, 254)",
      "tab_line": "rgb(255, 164, 0)",
      "popup": "rgb(4, 0, 4)",
      "popup_text": "rgb(226, 91, 254)",
      "tab_loading": "rgb(255, 164, 0)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{25ef9d22-cb2c-41d7-bd9c-0decac1cfe50}"
    }
  }
}