Examine source code of Bubble OOOO

{
  "theme": {
    "images": {
      "theme_frame": "Bubbly.jpg"
    },
    "colors": {
      "frame": "#f7f4f4",
      "tab_background_text": "#030303"
    }
  },
  "version": "2.0",
  "name": "Bubble OOOO",
  "manifest_version": 2,
  "description": "Bubbles bubbles and more bubbles."
}