Examine source code of The Furious Turtle

{
  "theme": {
    "images": {
      "theme_frame": "FT_Firefox_persona_Head.png"
    },
    "colors": {
      "frame": "#2e2e2e",
      "tab_background_text": "#f0f0f0"
    }
  },
  "version": "2.0",
  "name": "The Furious Turtle",
  "manifest_version": 2,
  "description": "The Furious Turtle in all his Green and White Glory"
}