Examine source code of disappear

{
  "name": "disappear",
  "manifest_version": 2,
  "version": "5.0",
  "theme": {
    "images": {
      "theme_frame": "555cfulluyop.png"
    },
    "colors": {
      "frame": "rgba(229, 230, 232, 1)",
      "tab_background_text": "rgba(173, 136, 48, 1)",
      "toolbar": "rgba(240, 240, 240, 0.9)",
      "bookmark_text": "rgba(133, 133, 133, 1)",
      "toolbar_field_text": "rgba(107, 107, 107, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{ff59312f-24eb-413b-9d4f-72a4cf14fc95}"
    }
  }
}