Examine source code of BLUE DarkMode

{
  "name": "Blue Darkmode",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "Horizontal_DarkBlue_Wallpaper.jpg"
    },
    "colors": {
      "frame": "rgba(30, 40, 55, 1)",
      "tab_background_text": "rgba(90, 95, 135, 1)",
      "toolbar": "rgba(70, 70, 90, 1)",
      "bookmark_text": "rgba(80, 95, 135, 1)",
      "toolbar_field": "rgba(225, 225, 245, 1)",
      "toolbar_field_text": "rgba(70, 70, 120, 1)",
      "tab_line": "rgba(50, 60, 75, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{3c87037a-8b5a-4db7-ad61-0b3def9e5640}"
    }
  }
}