Examine source code of Bookmark Menu

{
  "manifest_version": 2,
  "default_locale": "en",
  "browser_specific_settings": {
    "gecko": {
      "id": "Bookmark_Menu@firefox.clu-os.net",
      "strict_min_version": "66.0"
    }
  },
  "name": "__MSG_extensionName__",
  "description": "__MSG_extensionDescription__",
  "version": "0.2.0",
  "icons": {
    "48": "_images/icon.svg",
    "96": "_images/icon.svg"
  },
  "background": {
    "scripts": [
      "_scripts/FFXPlaces.js",
      "options_default.js",
      "background.js"
    ]
  },
  "options_ui": {
    "browser_style": false,
    "open_in_tab": false,
    "page": "options.html"
  },
  "permissions": [
    "bookmarks",
    "menus",
    "storage"
  ]
}