Examine source code of Adapt-1

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#999999",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Adapt-1",
  "manifest_version": 2,
  "description": "This is a Firefox / Thunderbird persona, which is based upon one of my unreleased wallpapers. There will most likely be a series of a bit more high-end personas like this. Enjoy and give  feedback."
}