Examine source code of Cohezio extension eid

{
  "name": "Cohezio extension eid",
  "description": "Extension is use to call native exe that send eid infos back",
  "externally_connectable": {
    "matches": [
      "https://*.cohezio4u.be/*",
      "https://*.extranet-test.cohezio.be/*",
      "*://localhost/*"
    ]
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "author": "Cohezio",
  "icons": {
    "16": "cohezio-16.png",
    "32": "cohezio-32.png",
    "64": "cohezio-64.png",
    "128": "cohezio-128.png"
  },
  "manifest_version": 3,
  "permissions": [
    "nativeMessaging"
  ],
  "version": "1.0",
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_start"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{3f850f1f-26d5-49e8-b2c9-511e84078f69}"
    }
  }
}