Examine source code of Cold Nord

{
  "name": "Humble Nord",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "fon2.png"
    },
    "colors": {
      "frame": "rgba(76, 86, 106, 1)",
      "tab_background_text": "rgba(229, 233, 240, 1)",
      "toolbar": "rgba(46, 52, 64, 1)",
      "bookmark_text": "rgba(216, 222, 233, 1)",
      "toolbar_field": "rgba(76, 86, 106, 1)",
      "toolbar_field_text": "rgba(216, 222, 233, 1)"
    }
  }
}