After a long time away from Pale Moon, I decided to try it again today. Already I'm having issues, unfortunately.
Here is what my Namecheap control panel looks like in Firefox:
Here is what it looks like in Pale Moon 27.4.2:
None of my domains are listed in Pale Moon while they appear in fine in Firefox. I have tried in Safe Mode (with Add-ons disabled) as well and the issue does not resolve. The URL is: namecheap.com
I am using the pre-built binary from the Pale Moon site on PCLinuxOS 64-bit.
Here is some output to the terminal when Pale Moon is started: