Examine source code of dark green-1

{
  "name": "dark green-1",
  "manifest_version": 2,
  "version": "4.0",
  "theme": {
    "images": {
      "theme_frame": "external-content.duckduckgo.com.gif"
    },
    "colors": {
      "frame": "rgba(24, 54, 61, 0.91)",
      "tab_background_text": "rgba(255, 255, 255, 0.45)",
      "toolbar": "rgba(9, 92, 45, 0.53)",
      "bookmark_text": "rgba(255, 255, 255, 0.63)",
      "toolbar_field": "rgba(11, 15, 33, 0.4)",
      "toolbar_field_text": "rgba(255, 255, 255, 0.45)"
    }
  }
}