How can I make Fierbug stay enabled when I close the page it was opened for?

Question

Firebug

Hello.
Actually - the whole question is in the title, I'll try to describe it in more detail:
There is a web page for which I activated Fierbug (namely, I use the Network tab). After certain actions on this page, two requests are sent and it immediately closes, and with it the Fierbug window, and I don’t have time to look at anything in it. This happens even if Fierbug itself is set to "separate window" mode.
How can I disable this so that Fierbug windows remain after the page is closed?
Or, if that's not possible, please advise how to properly view the HTTP S requests sent by Fierfox in the HTTP Analyzer. or just advise any tool to solve this task easily.
Thank you!

Answer 1

I could not do this with Fierbug.
With HTTP Analyzer, the problem was that I was a noob who did not know what HTTP 2 protocol was, all links with which HTTP Analyzer shows like this - https://*
Disabled HTTP 2 in Fierfox - and normal requests went, which look like HTTP without any problems analyzer.