Examine source code of Thunderbird Brown

{
  "theme": {
    "images": {
      "theme_frame": "Thunderbird_Header.png"
    },
    "colors": {
      "frame": "#fce9c1",
      "tab_background_text": "#000000"
    }
  },
  "version": "2.0",
  "name": "Thunderbird Brown",
  "manifest_version": 2,
  "description": "Thunderbird Brown for email lovers, Made for Firefox 4 by TDJUNKIE."
}