Examine source code of Underwater Creatures

{
  "theme": {
    "images": {
      "theme_frame": "seaheader.png"
    },
    "colors": {
      "frame": "#0816d6",
      "tab_background_text": "#0fdbfa"
    }
  },
  "version": "2.0",
  "name": "Underwater Creatures",
  "manifest_version": 2,
  "description": "A picture of a squid, eel, fish, and octopus."
}