That's by design. uBlock is blocking ad and spyware network requests. It's common for sites to crash or error because of this. They'll depend on a call to Google or Sentry or DataDog to succeed before continuing with their initialization. As a platform engineer for several web properties, I die a little inside every time I see this happen.
My work blocks all kinds random software, Firefox included. My workaround is using Brave browser and a service like NextDNS either as an app or as the DNS provider for my home network. It's not perfect but it's flexible enough.