firefox52 core dump on RPI2 NetBSD9.1

[Mayuresh <mayuresh%acm.org@localhost>]

This is using binary packages from
http://cdn.NetBSD.org/pub/pkgsrc/packages/NetBSD/earmv7hf/9.1/All

on NetBSD armv7 9.1_STABLE NetBSD 9.1_STABLE (GENERIC) #0: Tue Nov 10
11:45:35 UTC 2020
mkrepro%mkrepro.NetBSD.org@localhost:/usr/src/sys/arch/evbarm/compile/GENERIC evbarm

#/usr/pkg/bin/firefox52 
Assertion failure: !joinable(), at /scratch/work/www/firefox52/work/firefox-52.9.0esr/js/src/threading/Thread.h:122
Segmentation fault (core dumped)

gdb where output snipped similar lines:

...
BFD: /usr/pkg/lib/libdbus-glib-1.so.2: invalid string offset 9426 >= 2737 for section `.strtab'
BFD: /usr/pkg/lib/libdbus-glib-1.so.2: invalid string offset 3088 >= 2737 for section `.strtab'
BFD: /usr/pkg/lib/libdbus-glib-1.so.2: invalid string offset 2990 >= 2737 for section `.strtab'
BFD: /usr/pkg/lib/libdbus-glib-1.so.2: invalid string offset 6196 >= 2737 for section `.strtab'
Core was generated by `firefox52'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0  0x7bb58c70 in _lwp_kill () from /usr/lib/libc.so.12
[Current thread is 1 (process 1)]
(gdb) 


Any quick workarounds? I need a browser with JS, but preferably firefox,
as there are some marionette scripts to automate routine tasks.

-- 
Mayuresh