Examine source code of Pale Yellow Circles

{
  "theme": {
    "images": {
      "theme_frame": "fire.png"
    },
    "colors": {
      "frame": "#3d3b3b",
      "tab_background_text": "#000"
    }
  },
  "version": "2.0",
  "name": "Pale Yellow Circles",
  "manifest_version": 2,
  "description": "Pale Yellow And White Interlocking Concentric Circles"
}