Examine source code of deen

{
  "name": "deen",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "descargar.jpg"
    },
    "colors": {
      "frame": "rgba(0, 47, 73, 1)",
      "tab_background_text": "rgba(148, 148, 148, 1)",
      "toolbar": "rgba(133, 133, 133, 0.21)",
      "bookmark_text": "rgba(145, 145, 145, 1)",
      "toolbar_field": "rgba(138, 138, 138, 0)",
      "toolbar_field_text": "rgba(133, 133, 133, 1)",
      "tab_line": "rgba(148, 148, 148, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{2f18c656-e7e9-491c-baf8-58474deb3376}"
    }
  }
}