Examine source code of scary whale

{
  "theme": {
    "images": {
      "theme_frame": "sharkheader.jpg"
    },
    "colors": {
      "frame": "#979ec2",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "scary whale",
  "manifest_version": 2,
  "description": "Scary whale is floating in the corner of the header... So mystic and huge creature..."
}