Firefox 63.0.1_1 (on 11.2-release) refuses to open *ANY* site/url when attempting the following message is sent to the console: ###!!! [Parent][MessageChannel] Error: (msgtype=0x190084,name=PBrowser::Msg_Destroy) Channel error: cannot send/recv For referemce: This is r483632 from svn and the machine is: FreeBSD lilith 11.2-RELEASE-p4 FreeBSD 11.2-RELEASE-p4 #0 r339065: Mon Oct 1 14:01:40 EDT 2018 root@lilith:/usr/obj/usr/src/sys/GENERIC amd64
Did you read pkg-message note added in ports r480744?
According to the error message it's probably another e10s issue. *** This bug has been marked as a duplicate of bug 232701 ***