Examine source code of Red John Smiley_X01

{
  "theme": {
    "images": {
      "theme_frame": "RedJohnSmiley_X01_Header.png"
    },
    "colors": {
      "frame": "#cfcfcf",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Red John Smiley_X01",
  "manifest_version": 2,
  "description": "Red John Smiley_X01\n\nFor Firefox Version 19.0\n\nIn my browser only works:\nHeader in px: 1366 x 107\nFooter in px: 1366 x 46\nSo I rescaled it to 2553 x 200 (Header) and 2970 x 100 (Footer).\nAnd it still works but when I create a new persona with the same porportion it don't work anymore.\n\nNote:\nDownload PixelRuler (Freeware) to create your own optimal persona. \nIt helped me to find out the optimal width and height for my browser.\n\nFYI: You're right, english is not my first language."
}