Examine source code of Airplane Theme

{
  "manifest_version": 2,
  "name": "Airplane Theme",
  "version": "1.0",
  "description": "A Firefox theme inspired by airplanes",
  "theme": {
    "images": {
      "theme_frame": "images/theme_frame.png"
    },
    "colors": {
      "frame": "rgba(255, 255, 255, 1)",
      "tab_background_text": "rgba(0, 0, 0, 1)",
      "toolbar": "rgba(191, 191, 191, 1)",
      "toolbar_text": "rgba(0, 0, 0, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{89d031a5-4537-4f60-8e66-6f91ee5d11f9}"
    }
  }
}