Examine source code of OS Naval

{
  "name": "OS Naval",
  "manifest_version": 2,
  "version": "2.0",
  "theme": {
    "images": {
      "theme_frame": "naval.jpg"
    },
    "colors": {
      "frame": "rgba(18, 31, 41, 1)",
      "tab_background_text": "rgba(163, 140, 56, 1)",
      "toolbar": "rgba(18, 31, 41, 1)",
      "bookmark_text": "rgba(224, 224, 224, 1)",
      "toolbar_field": "rgba(36, 66, 90, 1)",
      "toolbar_field_text": "rgba(163, 140, 56, 1)",
      "tab_line": "rgba(163, 140, 56, 1)"
    }
  }
}