Examine source code of Blue Flower -GD-

{
  "theme": {
    "images": {
      "theme_frame": "blue_flower_header.jpg"
    },
    "colors": {
      "frame": "#757575",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Blue Flower -GD-",
  "manifest_version": 2,
  "description": "Blue Flower is my first Forefox Persona. I hope you'll like it!"
}