I Adrian, probably this small report can made understand one of the reason why firefox crash on debian PPC64.
Plus i made an experiment yesterday On this last sid i installed one of my archived firefox esr 45.x ( from old debian sid archive) that is working on others ppc64 distros (fedora 25 ppc64) but here crash exactly like the new versions . look like the issue come on debian because a pipe error. _____log____ ###!!! [Child][MessageChannel] Error: (msgtype=0xE20003,name=PTexture::Msg_Destroy) Channel error: cannot send/recv ###!!! [Child][MessageChannel] Error: (msgtype=0x3E0003,name=PCompositable::Msg_Destroy) Channel error: cannot send/recv [Child 3646] ###!!! ABORT: Aborting on channel error.: file /build/firefox-esr-iI1OHq/firefox-esr-52.3.0esr/ipc/glue/MessageChannel.cpp, line 2152 [Parent 3937] WARNING: pipe error (57): Connection reset by peer: file /build/firefox-esr-iI1OHq/firefox-esr-52.3.0esr/ipc/chromium/src/chrome/common/ipc_channel_posix.cc, line 322 [Parent 3937] WARNING: pipe error (64): Connection reset by peer: file /build/firefox-esr-iI1OHq/firefox-esr-52.3.0esr/ipc/chromium/src/chrome/common/ipc_channel_posix.cc, line 322 ___________________ hope it can help Ciao Luigi