Examine source code of Funny Flowers

{
  "theme": {
    "images": {
      "theme_frame": "fej.jpg"
    },
    "colors": {
      "frame": "#0c6b00",
      "tab_background_text": "#156100"
    }
  },
  "version": "2.0",
  "name": "Funny Flowers",
  "manifest_version": 2,
  "description": "Colorize your Firefox with these lovely happy flowers:)"
}