Examine source code of KOCT

{
  "manifest_version": 2,
  "name": "__MSG_extensionName__",
  "description": "__MSG_extensionDescription__",
  "version": "0.4.21",
  "applications": {
    "gecko": {
      "id": "koct@koha.fr"
    }
  },
  "icons": {
    "48": "icons/koha-48.png",
    "96": "icons/koha-96.png"
  },
  "permissions": [
    "tabs",
    "storage",
    "<all_urls>",
    "downloads"
  ],
  "browser_action": {
    "default_icon": "icons/koha-32.png",
    "default_title": "Koha Offline Circulation Tool"
  },
  "background": {
    "scripts": [
      "background-script.js"
    ]
  },
  "options_ui": {
    "page": "options.html"
  },
  "default_locale": "en"
}