Examine source code of Random Doodles on Black

{
  "theme": {
    "images": {
      "theme_frame": "random_doodles_on_black.jpg"
    },
    "colors": {
      "frame": "#858585",
      "tab_background_text": "#fafafa"
    }
  },
  "version": "2.0",
  "name": "Random Doodles on Black",
  "manifest_version": 2,
  "description": "Some random doodles in different shades of gray on a black background. Nothing fancy"
}