Examine source code of NooRex native message

{
  "name": "NooRex native message",
  "description": "Remote call native function.",
  "version": "1.0.2resigned1",
  "manifest_version": 2,
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "icons": {
    "128": "icon.png"
  },
  "permissions": [
    "tabs",
    "nativeMessaging"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "all_frames": true,
      "run_at": "document_start"
    }
  ],
  "applications": {
    "gecko": {
      "id": "noorex_api@noorex.com",
      "strict_min_version": "47.0"
    }
  },
  "browser_action": {
    "default_icon": "icon.png",
    "default_popup": "n_plugin_firefox_popup.html"
  }
}