Examine source code of Go left

{
  "theme": {
    "images": {
      "theme_frame": "3000200.jpg"
    },
    "colors": {
      "frame": "#718bd9",
      "tab_background_text": "#010847"
    }
  },
  "version": "2.0",
  "name": "Go left",
  "manifest_version": 2
}