Firefox crash

[George Mitchell]

Firefox reliably dumps core trying to display:

https://media.amtrak.com/media-images/

This is "Firefox Quantum" (66.0.3 64-bit) compiled locally with:

# This file is auto-generated by 'make config'.
# Options for firefox-63.0_1,1
_OPTIONS_READ=firefox-63.0_1,1
_FILE_COMPLETE_OPTIONS_LIST=CANBERRA DBUS DEBUG FFMPEG GCONF
INTEGER_SAMPLES LIBPROXY OPTIMIZED_CFLAGS PROFILE TEST WAYLAND ALSA JACK
PULSEAUDIO SNDIO
OPTIONS_FILE_UNSET+=CANBERRA
OPTIONS_FILE_SET+=DBUS
OPTIONS_FILE_UNSET+=DEBUG
OPTIONS_FILE_SET+=FFMPEG
OPTIONS_FILE_UNSET+=GCONF
OPTIONS_FILE_UNSET+=INTEGER_SAMPLES
OPTIONS_FILE_UNSET+=LIBPROXY
OPTIONS_FILE_UNSET+=OPTIMIZED_CFLAGS
OPTIONS_FILE_UNSET+=PROFILE
OPTIONS_FILE_UNSET+=TEST
OPTIONS_FILE_UNSET+=WAYLAND
OPTIONS_FILE_SET+=ALSA
OPTIONS_FILE_UNSET+=JACK
OPTIONS_FILE_UNSET+=PULSEAUDIO
OPTIONS_FILE_UNSET+=SNDIO

on FreeBSD 11.2-RELEASE-p8 #1 r343789

I can't figure out how to compile with debugging symbols.  "pstack"
on my core file says:

(core file "firefox.core"): /usr/local/bin/firefox
----------------- thread -1 (running) -----------------
 0x80208d47a ???????? (11b76432, 8, ffffffff, 0, 400, 0)
 0x811b76432 ???????? (123d1745, 8, 2363898, 8, 12b59ae5, 0)
 0x8123d1745 ???????? (1da9954, 8, 0, 7fff, 1, 0)
 0x801da9954 ???????? (1da8eb2, 8, 123d15f0, 8, 51, 0)
 0x801da8eb2 ???????? (ffffe193, 7fff, 1da8d70, 8, 0, 0)
 0x7fffffffe193 ???????? (e8b2f6c, 8, df109810, 7fff, e91ac4e, 8)
 0x80e8b2f6c ???????? (e91ac4e, 8, 21af9f40, 8, 1e9aab58, 8)
 0x80e91ac4e ???????? (e94c63d, 8, 0, 0, 0, 1)
 0x80e94c63d ???????? (e91e30e, 8, 1435ff20, 8, 1e9aab58, 8)
 0x80e91e30e ???????? (e91e182, 8, df109910, 7fff, 2078374, 4)
 0x80e91e182 ???????? (e9230f5, 8, 1e9aab50, 8, 27efbb88, 8)
 0x80e9230f5 ???????? (e9229c9, 8, df1099e0, 7fff, 23e5a, 11)
 0x80e9229c9 ???????? (e94c9ae, 8, df109a30, 7fff, 21073f1, 18)
 0x80e94c9ae ???????? (e925a7c, 8, 27efbb88, 8, df109aa0, 7fff)
 0x80e925a7c ???????? (ea0a84b, 8, df109bf0, 7fff, e95b405, 0)
 0x80ea0a84b ???????? (e8aee92, 8, 1, 0, 21b2aa00, 8)
 0x80e8aee92 ???????? (e8adddc, 8, df109c90, 7fff, 2533f738, 8)
 0x80e8adddc ???????? (e8ae95e, 8, 27efbb40, 8, df109e40, 7fff)
 0x80e8ae95e ???????? (e873d35, 8, 20a4f000, 8, df109e40, 7fff)
 0x80e873d35 ???????? (e87404b, 8, 0, 0, 0, 0)
 0x80e87404b ???????? (e874881, 8, 236b200, 8, 21ad7f88, 8)
 0x80e874881 ???????? (e873748, 8, 21eb27b0, 8, 1, 0)
 0x80e873748 ???????? (e889cf5, 8, 0, 0, 0, 0)
 0x80e889cf5 ???????? (e879f2a, 8, df109ff0, 7fff, 1da3c06, 8)
 0x80e879f2a ???????? (1da3c06, 8, 0, 0, 0, 0)
 0x801da3c06 ???????? (0, 0)

which seems less than helpful.  "make WITH_DEBUG=yes" doesn't seem
to get me debugging symbols.  If you can tell me how to compile
with symbols I will try to get you a more helpful stack trace.  But
the cited page crashes 100% of the time.               -- George

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