Examine source code of Adwaita Dark - Blue

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Yaru Dark - Blue",
  "theme": {
    "images": {},
    "properties": {},
    "colors": {
      "toolbar": "rgb(44, 44, 44)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(34, 34, 34)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(34, 34, 34)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(0, 120, 239)",
      "popup": "rgb(34, 34, 34)",
      "popup_text": "rgb(255, 255, 255)",
      "toolbar_field_border_focus": "rgb(0, 120, 239)",
      "tab_loading": "rgb(0, 120, 239)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{7a15c078-04e0-4b1b-bab8-6bf70ae69505}"
    }
  }
}