Examine source code of modernminimal

{
  "name": "Modern",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "0E0E0E.png"
    },
    "colors": {
      "frame": "rgba(14, 14, 15, 1)",
      "tab_background_text": "rgba(92, 92, 92, 1)",
      "toolbar": "rgba(32, 36, 41, 1)",
      "bookmark_text": "rgba(194, 194, 194, 1)",
      "toolbar_field": "rgba(14, 14, 15, 1)",
      "toolbar_field_text": "rgba(92, 92, 92, 1)"
    }
  }
}