Examine source code of Colourful stars

{
  "theme": {
    "images": {
      "theme_frame": "stars.jpg"
    },
    "colors": {
      "frame": "#877d7d",
      "tab_background_text": "#e5ed71"
    }
  },
  "version": "2.0",
  "name": "Colourful stars",
  "manifest_version": 2,
  "description": "Starry background"
}