Examine source code of Royale Firefox

{
  "theme": {
    "images": {
      "theme_frame": "header.jpg"
    },
    "colors": {
      "frame": "#33cc00",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Royale Firefox",
  "manifest_version": 2,
  "description": "This teme is for better integration of firefox with the Royale Theme for WinXP. Really, the best size for Footer image is 2500x50 and for the header image 2500x187."
}