Examine source code of amWRit

{
  "theme": {
    "images": {
      "theme_frame": "mozilla_amWRit_addon.jpg"
    },
    "colors": {
      "frame": "rgba(229,230,232,1)",
      "tab_background_text": "#730575"
    }
  },
  "version": "2.0",
  "name": "amWRit",
  "manifest_version": 2,
  "description": "my first firefox persona -- doesn't have anything much, was just a try"
}