Examine source code of Colourful Kawaii

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Colourful",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "left bottom"
      ],
      "additional_backgrounds_tiling": [
        "repeat-x"
      ]
    },
    "colors": {
      "toolbar": "rgb(238, 149, 194)",
      "toolbar_text": "rgb(94, 236, 130)",
      "frame": "rgb(255, 255, 255)",
      "tab_background_text": "rgb(255, 102, 255)",
      "toolbar_field": "rgb(131, 197, 240)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(135, 208, 174)",
      "popup": "rgb(153, 146, 202)",
      "popup_text": "rgb(255, 255, 255)",
      "tab_loading": "rgb(135, 208, 174)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{961c9628-f947-4bbb-a670-7050206b3569}"
    }
  }
}