Examine source code of red polygon

{
  "name": "red polygon",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "HD-wallpaper-red-mosaic-low-poly-art-red-polygonal-background-polygonal-texture-red-background-low-poly-textures-abstract-textures-geometric-backgrounds.jpg"
    },
    "colors": {
      "frame": "rgba(255, 0, 0, 1)",
      "tab_background_text": "rgba(0, 0, 0, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{3e26f540-3cdc-4d8a-b28e-bf43bb8ccce7}"
    }
  }
}