Examine source code of Northwich 1874

{
  "name": "Northwich 1874",
  "manifest_version": 2,
  "version": "5.0",
  "theme": {
    "images": {
      "theme_frame": "1874 Badge 2.20 Dec.png"
    },
    "colors": {
      "frame": "rgba(44, 128, 23, 1)",
      "tab_background_text": "rgba(0, 0, 0, 1)",
      "toolbar": "rgba(183, 232, 144, 1)",
      "bookmark_text": "rgba(83, 174, 230, 1)",
      "toolbar_field": "rgba(242, 223, 223, 1)",
      "toolbar_field_text": "rgba(15, 212, 247, 1)",
      "tab_line": "rgba(0, 0, 0, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{c044b171-ca0c-4e1b-ab59-ae4dce9ef012}"
    }
  }
}