Make sure you are not blocking content.

Diagnose Firefox issues using Troubleshoot(Safe) Mode {web link}

A small dialog should appear. Click Start In Troubleshoot(Safe) Mode (not Refresh). Is the problem still there?

https://support.mozilla.org/en-US/kb/enhanced-tracking-protection-firefox-desktop

Many site issues can be caused by corrupt cookies or cache.

Warning ! ! This will log you out of sites you're logged in to. You may also lose any settings for that website.

• Delete cookies to remove the information websites have stored on your computer {web link}

• How to clear the Firefox cache {web link}

As I said I tried Troubleshoot Mode already, disabling all add-ons and clearing cookies and data. Is it automated response or you have no Firefox? Should I provide information where to find it and how to install it?

It is not only my problem: others suggesting to switch to Edge or Chrome where it works.

As I said I tried Troubleshoot Mode already . . . .

What about the rest of my post?

As I twice said I cleared data and cookies, still hangs. Edge works.

Start your Computer in safe mode with network support. Then start Firefox. Try Secure websites. Is the problem still there?

Starting Any Computer In Safe Mode (web link) Free Online Encyclopedia

https://www.bleepingcomputer.com/tutorials/how-to-start-windows-in-safe-mode/

https://www.digitalcitizen.life/4-ways-boot-safe-mode-windows-10/ +++++++++++++++++++++++++++++++++++++++++++++++ If the problem goes away with the computer in Safe Mode, the problem is with one of the other programs on the system.

As a test, disable your protection programs.

I have default windows security (defender and firewall). I don't think it is good idea to fix Firefox problems.

Start your Computer in safe mode with network support. Then come here https://support.mozilla.org/

Mozilla is a secured website. You should be safe. This is just a test.

I did nothing, maybe it was Firefox update but it works now.

Well, here's hoping.