Hi all,
so connecting to MetaHumans seemed almost impossible for me, I tried for about a month going through the Quixel Bridge portal within Unreal Engine 5, using FireFox as my default browser and could not connect receiving a “connected and disconnected error”, after doing some poking around I realized the workaround to this was not only choosing the right compatible browser “Google Chrome” and launching Quixel Bridge as the standalone(DL/Install/Launch) to achieve a successful connection, also you will need to set Chrome as default browser so that when you click “Start MHC” button it launches Chrome. You can Google to find out how to do so on your system of choice, or if on Win just type in “default browser” in system search and you’ll see something pop up like “default apps” choose HTTPS and pick Chrome in order to get a successful connection, hope this helps and alleviate other from headaches that I have gone through. Like it if it helps show support! 
I’ve had no problems with mozilla
I have zero chrome on my machines
@christuusgnosis Meaning if you had issue same as me, as you know computer topology is uniquely different for every other individual, not everybody is running the same operating system, not everyone has the same specs nor does everyone have the same maintenance procedures. But I am happy that you do not have an issue,Cheers!