Examine source code of LinkedIn Chat Export

{
  "manifest_version": 2,
  "name": "LinkedIn Chat Export",
  "description": "Export LinkedIn conversations as Markdown or JSON",
  "version": "0.1.0",
  "icons": {
    "16": "icon-16.png",
    "48": "icon-48.png",
    "128": "icon-128.png"
  },
  "permissions": [
    "activeTab"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "linkedin-chat-export@simonhartcher.com",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    }
  },
  "browser_action": {
    "default_title": "LinkedIn Chat Export",
    "default_popup": "popup.html"
  },
  "content_scripts": [
    {
      "matches": [
        "https://www.linkedin.com/*"
      ],
      "run_at": "document_idle",
      "js": [
        "content-scripts/content.js"
      ]
    }
  ]
}