Examine source code of iCloud Bookmarks

{
  "manifest_version": 2,
  "name": "__MSG_extName__",
  "version": "2.3.40",
  "default_locale": "en",
  "description": "__MSG_extDescription__",
  "icons": {
    "128": "images/icloud-icon-128x128.png"
  },
  "applications": {
    "gecko": {
      "id": "firefoxdav@icloud.com",
      "strict_min_version": "52.0"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": {
      "19": "images/icloud-icon-19x19.png",
      "38": "images/icloud-icon-38x38.png"
    },
    "default_title": "__MSG_extName__",
    "browser_style": true,
    "default_popup": "popup.html"
  },
  "web_accessible_resources": [
    "images/icloud-icon-128x128.png",
    "popup.css"
  ],
  "permissions": [
    "bookmarks",
    "nativeMessaging",
    "storage"
  ]
}