Examine source code of Christmas 4 Firefox

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#080808",
      "tab_background_text": "#77fc68"
    }
  },
  "version": "2.0",
  "name": "Christmas 4 Firefox",
  "manifest_version": 2,
  "description": "To all Our Friends here on Firefox May your Holidays be filled with joy and Family Love! \n\nMerry Christmas to All Firefox Friends!"
}