Examine source code of Transparent box

{
  "name": "Transparent box",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "background-powerpoint-cong-nghe-34.jpg"
    },
    "colors": {
      "frame": "rgba(229, 230, 232, 1)",
      "tab_background_text": "rgba(34, 255, 0, 1)",
      "toolbar": "rgba(0, 0, 0, 0.27)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{147ae1a9-7e85-4c82-a698-5d4eeffb5067}"
    }
  }
}