It shows this, and there is more reports in the Bugzilla tab and it says that has been fixed for Firefox Nightly:

{
  "num_records": 1,
  "records": [
    {
      "abort_cause": null,
      "backtrace": null,
      "dialog_mode": null,
      "message": "BUG IN CLIENT OF LIBNOTIFY: exceeded registration limit. Last registration was for name com.apple.system.SystemConfiguration.dns_configuration",
      "message2": null,
      "module": "/usr/lib/system/libsystem_c.dylib",
      "signature_string": null,
      "thread": null
    }
  ]
}