Examine source code of Session Saver Pro

{
  "manifest_version": 2,
  "name": "Session Saver",
  "version": "1.0",
  "description": "Save and restore browsing sessions with ease.",
  "permissions": [
    "tabs",
    "storage"
  ],
  "browser_action": {
    "default_popup": "popup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{576dfdd5-8c95-4f99-8a7b-a7a653d4b235}"
    }
  }
}