I thought so too but then when I looked for such changes, I couldn't find any.
cvs -qd anoncvs@anoncvs.ca.openbsd.org:/cvs get -P ports/www/mozilla-firefox cd ports/www/mozilla-firefox grep -Ri malloc .
./patches/CVS/Entries:/patch-js_src_ctypes_libffi_src_dlmalloc_c/1.4/Tue Sep 2 16:43:04 2014// ./patches/patch-js_src_ctypes_libffi_src_dlmalloc_c:$OpenBSD: patch-js_src_ctypes_libffi_src_dlmalloc_c,v 1.4 2014/09/02 16:43:04 landry Exp $ ./patches/patch-js_src_ctypes_libffi_src_dlmalloc_c:--- js/src/ctypes/libffi/src/dlmalloc.c.orig Wed Jul 23 05:13:14 2014 ./patches/patch-js_src_ctypes_libffi_src_dlmalloc_c:+++ js/src/ctypes/libffi/src/dlmalloc.c Thu Jul 24 20:47:22 2014
I thought so too but then when I looked for such changes, I couldn't find any.
All that was found was a few irrelevant things which matched because "malloc" was in the name of the referenced files: