The site is not available in all regions.
Try changing DNS over HTTPS (DoH) to "Off" or "Max Protection" and in Connection Settings change "Use system proxy settings" to "No proxy".
Does it still happen in Troubleshoot Mode?
The site is not available in all regions.
Try changing [[Configure DNS over HTTPS protection levels in Firefox|DNS over HTTPS (DoH)]] to "Off" or "Max Protection" and in [[Connection settings in Firefox|Connection Settings]] change "Use system proxy settings" to "No proxy".
Does it still happen in [[Diagnose Firefox issues using Troubleshoot Mode|Troubleshoot Mode]]?