Examine source code of Postage Life

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#b3b38d",
      "tab_background_text": "#636363"
    }
  },
  "version": "2.0",
  "name": "Postage Life",
  "manifest_version": 2,
  "description": "A day in the life of postage"
}