Examine source code of Broadstone

{
  "theme": {
    "images": {
      "theme_frame": "Broadstone2.jpg"
    },
    "colors": {
      "frame": "#6b6a6a",
      "tab_background_text": "#f00909"
    }
  },
  "version": "2.0",
  "name": "Broadstone",
  "manifest_version": 2
}