Examine source code of Spiderman

{
  "name": "Spiderman",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "wallpaper2.jpg"
    },
    "colors": {
      "frame": "rgba(255, 255, 255, 1)",
      "tab_background_text": "rgba(250, 252, 255, 1)",
      "toolbar": "rgba(207, 27, 27, 0.5)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{d498b203-368e-49a9-9259-70d5366687fe}"
    }
  }
}