Examine source code of DuckDuckGo

{
  "name": "DuckDuckGo",
  "manifest_version": 2,
  "version": "4.0",
  "theme": {
    "images": {
      "theme_frame": "lataus.png"
    },
    "colors": {
      "frame": "rgba(255, 255, 255, 1)",
      "tab_background_text": "rgba(222, 88, 51, 1)",
      "toolbar": "rgba(222, 88, 51, 1)",
      "bookmark_text": "rgba(255, 255, 255, 1)",
      "toolbar_field": "rgba(255, 255, 255, 1)",
      "toolbar_field_text": "rgba(222, 91, 51, 1)",
      "tab_line": "rgba(222, 88, 51, 0.75)"
    }
  }
}