Examine source code of Maille

{
  "theme": {
    "images": {
      "theme_frame": "8in1.jpg"
    },
    "colors": {
      "frame": "#ebe4b9",
      "tab_background_text": "#7a1009"
    }
  },
  "version": "2.0",
  "name": "Maille",
  "manifest_version": 2
}