Examine source code of GruvBox Heavy Dark

{
  "name": "GruvBox Heavy Dark",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "Untitled.png"
    },
    "colors": {
      "frame": "rgba(29, 32, 33, 1)",
      "tab_background_text": "rgba(213, 196, 161, 1)",
      "toolbar": "rgba(29, 32, 33, 1)",
      "bookmark_text": "rgba(213, 196, 161, 1)",
      "toolbar_field": "rgba(50, 56, 59, 1)",
      "toolbar_field_text": "rgba(213, 196, 161, 1)",
      "tab_line": "rgba(254, 128, 25, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{d30ae62b-3e2c-4b73-b623-e66625e4d929}"
    }
  }
}