FireFox for Android 138.0.4: slow resolving of site names or something

I don't know from which version of FF it started exactly, but recently loading of websites starts after huge pause or fails at all, the same is with elements of web pages if those are located on different domain. This is only FF problem, other browsers load pages instantly. I have tried to delete cache, data and FF completely and reinstall anew, it doesn't help. I can only guess what causes it, probably some DNS connection issues.