pkg/43139: Firefox fails name resolution when using 'files nis dns'

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>Number:         43139
>Category:       pkg
>Synopsis:       Firefox fails name resolution when using 'files nis dns'
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    pkg-manager
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Thu Apr 08 10:25:00 +0000 2010
>Originator:     Chavdar Ivanov
>Release:        i386-current
>Organization:
Delcam Plc
>Environment:
$ uname -a
NetBSD loan8 5.99.25 NetBSD 5.99.25 (GENERIC) #4: Sat Apr  3 03:40:07 BST 2010  
root@uksup2:/usr/obj/usr-current/i386/sys/arch/i386/compile/GENERIC i386
>Description:
When using 

hosts: files nis dns 

in /etc/nsswitch.conf, firefox (in this case, 3.5.5) initially starts with the 
first tab OK, subsequent pages do not open. The program is responsive, but the 
dns query never returns. 
>How-To-Repeat:
Configure a system to use 'files nis dns' for name resolution and try to use 
firefox... 
>Fix:
I avoid the problem by periodically synchronizing my /etc/hosts file with the 
NIS yphosts database, then using 'files dns' for name resolution.