Examine source code of Session Backup Manager

{
  "manifest_version": 3,
  "name": "Session Backup Manager",
  "version": "1.0",
  "description": "Save and restore browsing sessions automatically, ensuring no tabs are lost.",
  "icons": {
    "128": "icons/icon128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{d9606f69-9676-4bd3-bca6-036a8940e2f2}"
    }
  },
  "permissions": [
    "tabs",
    "storage",
    "sessions"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "action": {
    "default_popup": "popup/popup.html",
    "default_icon": {
      "128": "icons/icon128.png"
    }
  }
}