Examine source code of Edge Theme

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Edge Colors Theme",
  "theme": {
    "images": {},
    "properties": {},
    "colors": {
      "toolbar": "rgb(59, 59, 59)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(32, 32, 32)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(43, 43, 43)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgba(248, 112, 140, 0)",
      "popup": "rgb(46, 46, 46)",
      "popup_text": "rgb(255, 255, 255)",
      "frame_inactive": "rgba(44, 47, 54, 0)",
      "popup_border": "rgba(52, 17, 17, 0)",
      "tab_loading": "rgba(248, 112, 140, 0)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{5174d124-e52d-4ce0-8a44-869e45f98677}"
    }
  }
}