Examine source code of CookiesIE

{
  "manifest_version": 2,
  "name": "CookiesIE",
  "version": "1.0",
  "description": "Simple Import/Export Cookies",
  "icons": {
    "48": "icons/icon-48.png"
  },
  "permissions": [
    "activeTab",
    "storage",
    "cookies",
    "downloads",
    "tabs",
    "<all_urls>",
    "browsingData",
    "contextualIdentities",
    "privacy"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {},
  "sidebar_action": {
    "default_title": "CookiesIE",
    "default_panel": "popup/index.html",
    "open_at_install": false
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{21f4f68e-d92a-4fdb-87b3-ef36a1953b68}"
    }
  }
}