Examine source code of I love Danbo

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#cccccc",
      "tab_background_text": "#cccccc"
    }
  },
  "version": "2.0",
  "name": "I love Danbo",
  "manifest_version": 2,
  "description": "This is the sweet mascot of Amazon. His name is Danbo."
}