Examine source code of Firefox in blue

{
  "theme": {
    "images": {
      "theme_frame": "firefox.png"
    },
    "colors": {
      "frame": "#9999ff",
      "tab_background_text": "#000000"
    }
  },
  "version": "2.0",
  "name": "Firefox in blue",
  "manifest_version": 2,
  "description": "A small Persona for all users they love blue.\nIncluding the right color for the All-in-one Sidebar."
}