Examine source code of Rain Bubbles

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#0a4d0a",
      "tab_background_text": "#94ebf7"
    }
  },
  "version": "2.0",
  "name": "Rain Bubbles",
  "manifest_version": 2,
  "description": "These bubbles taken while raining at our lake."
}