Examine source code of PDF Highlighter

{
  "manifest_version": 3,
  "name": "__MSG_appName__",
  "version": "1.3.2",
  "description": "__MSG_shortDesc__",
  "default_locale": "en",
  "permissions": [
    "contextMenus",
    "storage",
    "webNavigation",
    "webRequest"
  ],
  "host_permissions": [
    "http://*/*",
    "https://*/*",
    "file:///*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "icons": {
    "16": "icons/icon-16.png",
    "32": "icons/icon-32.png",
    "48": "icons/icon-48.png",
    "128": "icons/icon-128.png"
  },
  "action": {
    "default_title": "__MSG_appName__",
    "default_icon": {
      "16": "icons/icon-16.png",
      "32": "icons/icon-32.png",
      "48": "icons/icon-48.png",
      "128": "icons/icon-128.png"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "https://platform.pdfhighlighter.io/*",
        "https://app.pdfhighlighter.io/*",
        "https://pdfhighlighter.io/*"
      ],
      "js": [
        "site-bridge.js"
      ],
      "run_at": "document_start"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "pdf-highlighter@pdfhighlighter.io",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}