Examine source code of up in the sky

{
  "theme": {
    "images": {
      "theme_frame": "up_in_the_sky.jpg"
    },
    "colors": {
      "frame": "#2b0000",
      "tab_background_text": "#1a000d"
    }
  },
  "version": "2.0",
  "name": "up in the sky",
  "manifest_version": 2,
  "description": "a sunset over the clounds"
}