WordPress site keeps loading in Firefox

Hi everybody,
I’m having issues with my wordpress site. It works in each browser but firefox. My website just keeps loading and cannot load only in firefox. These problems started suddenly. It worked before. I uninstalled last plugin and swapped others, deleted everything from firefox.

Sometimes it loads, most of the time it doesn’t. It’s related to the front page. When I have a direct link to a specific page it works.

There is a link for a specific page: https://fotobretti.cz/en/2020/08/05/whispers-about-a-trade-fair-in-uherske-hradiste-mikroexpo/ it works.

https://fotobretti.cz isn’t working.

Can you help me please?

The page I need help with: [log in to see the link]