Examine source code of my message in a bottle

{
  "theme": {
    "images": {
      "theme_frame": "mymessageinabottle.jpg"
    },
    "colors": {
      "frame": "#3d91eb",
      "tab_background_text": "#fcf7f7"
    }
  },
  "version": "2.0",
  "name": "my message in a bottle",
  "manifest_version": 2,
  "description": "a message in a bottle lying on a beach"
}