strace midori 'https://mail.google.com/mail/?ui=html&zy=a'
....
stat64("/tmp/atgpc.log", {st_mode=S_IFREG|0666, st_size=519, ...}) = 0
open("/tmp/atgpc.log", O_RDWR|O_CREAT|O_APPEND, 0666) = 16
fstat64(16, {st_mode=S_IFREG|0666, st_size=519, ...}) = 0
mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb7f63000
write(16, "Netscape plugin trace [WebEx Plug"..., 51) = 51
close(16) = 0
munmap(0xb7f63000, 4096) = 0
chmod("/tmp/atgpc.log", 0666) = 0
--- SIGSEGV (Segmentation fault) @ 0 (0) ---
+++ killed by SIGSEGV +++
Helped to find that WebEx plugin needed to be removed :
rm ~/.mozilla/plugins/npatgpc.so