Examine source code of Edge by Doodle

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Edge by Doodle",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "center center"
      ],
      "additional_backgrounds_tiling": [
        "no-repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(0, 0, 0, 0.27)",
      "toolbar_text": "rgb(67, 194, 218)",
      "frame": "rgb(58, 114, 200)",
      "tab_background_text": "rgb(241, 241, 241)",
      "toolbar_field": "rgba(24, 156, 180, 0.43)",
      "toolbar_field_text": "rgb(67, 194, 218)",
      "tab_line": "rgb(241, 241, 241)",
      "popup": "rgb(58, 114, 200)",
      "popup_text": "rgb(241, 241, 241)",
      "icons_attention": "rgb(24, 156, 180)",
      "icons": "rgb(241, 241, 241)",
      "ntp_text": "rgb(24, 156, 180)",
      "popup_border": "rgb(24, 156, 180)",
      "tab_loading": "rgb(24, 156, 180)",
      "tab_text": "rgb(241, 241, 241)"
    }
  }
}