Examine source code of Blue Dark Scales

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Blue Scales",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "center center"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(7, 17, 84)",
      "toolbar_text": "rgb(211, 213, 255)",
      "frame": "rgb(2, 0, 68)",
      "tab_background_text": "rgb(211, 213, 255)",
      "toolbar_field": "rgb(12, 9, 107)",
      "toolbar_field_text": "rgb(211, 213, 255)",
      "tab_line": "rgb(11, 10, 105)",
      "popup": "rgb(7, 10, 84)",
      "popup_text": "rgb(211, 213, 255)",
      "tab_loading": "rgb(11, 10, 105)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{8efe285f-f535-451c-bb5b-0b162c5054d5}"
    }
  }
}