Examine source code of Sand on Mars

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#ffffff",
      "tab_background_text": "#000"
    }
  },
  "version": "2.0",
  "name": "Sand on Mars",
  "manifest_version": 2,
  "description": "Mars is covered with vast expanses of sand and dust and its surface is littered with rocks and boulders."
}