Examine source code of artic.mode

{
  "name": "artic.mode",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "wallhaven-4v7ovm.png"
    },
    "colors": {
      "frame": "rgba(4, 64, 94, 1)",
      "tab_background_text": "rgba(41, 23, 23, 1)",
      "toolbar": "rgba(36, 36, 36, 1)",
      "bookmark_text": "rgba(12, 13, 41, 1)",
      "toolbar_field": "rgba(23, 22, 22, 1)",
      "toolbar_field_text": "rgba(23, 7, 56, 1)"
    }
  }
}