I have a little userscript running on Tampermonkey in Firefox (chrome has the same behavior)

The xhr logs of these requests doesn't appear in the console or network analysis.

Because it is a cors request from https to a http service, we have to use GM_xmlhttpRequest() and cannot use fetch() or normal XmlHttpRequest

The request report sometimes an error and sometimes not, so the information would be very helpful to solve our issue. My question is, where I can find these logs, or how can I turn it on?