Examine source code of CirqleSync

{
  "manifest_version": 3,
  "name": "CirqleSync",
  "version": "1.0.0",
  "description": "Capture a LinkedIn profile into your CRM with one click.",
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "action": {
    "default_popup": "popup.html",
    "default_title": "CirqleSync",
    "default_icon": {
      "16": "icons/icon16.png",
      "48": "icons/icon48.png"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "storage",
    "activeTab",
    "scripting"
  ],
  "host_permissions": [
    "https://www.linkedin.com/in/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://www.linkedin.com/in/*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "cirqlesync@cirqle.cards",
      "strict_min_version": "115.0",
      "data_collection_permissions": {
        "required": [
          "personallyIdentifyingInfo",
          "websiteContent"
        ]
      }
    }
  }
}