Examine source code of Sync bookmarks to disk

{
  "manifest_version": 2,
  "name": "Sync bookmark to disk",
  "version": "1.2",
  "description": "Sync bookmark to disk",
  "icons": {
    "48": "icons/icon.png",
    "96": "icons/icon@2x.png"
  },
  "permissions": [
    "bookmarks",
    "nativeMessaging"
  ],
  "applications": {
    "gecko": {
      "id": "bookmark_to_disk@zoy.org",
      "strict_min_version": "50.0"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  }
}