Examine source code of Cookie manager

{
  "manifest_version": 2,
  "description": "__MSG_extensionDescription__",
  "name": "Cookie Manager",
  "version": "1.0.0",
  "default_locale": "en",
  "permissions": [
    "cookies",
    "<all_urls>",
    "activeTab",
    "storage",
    "browsingData",
    "contextualIdentities",
    "privacy"
  ],
  "optional_permissions": [
    "clipboardWrite"
  ],
  "browser_action": {
    "browser_style": true,
    "default_title": "Cookie Quick Manager",
    "default_popup": "menu.html",
    "default_icon": {
      "48": "icons/cookie48.png",
      "96": "icons/cookie96.png"
    }
  },
  "icons": {
    "48": "icons/cookie48.png",
    "96": "icons/cookie96.png"
  },
  "background": {
    "scripts": [
      "api.js",
      "background-script.js"
    ]
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{fec736b1-d62e-4780-be17-6e9bba3d4a6c}"
    }
  }
}