diff -up firefox-65.0/toolkit/moz.configure.disable-elfhack firefox-65.0/toolkit/moz.configure

--- firefox-65.0/toolkit/moz.configure.disable-elfhack	2019-01-28 14:16:48.530345132 +0100

+++ firefox-65.0/toolkit/moz.configure	2019-01-28 14:18:03.231029682 +0100

@@ -1036,7 +1036,7 @@ with only_when('--enable-compile-environ

                help='{Enable|Disable} elf hacks')

         set_config('USE_ELF_HACK',

-                   depends_if('--enable-elf-hack')(lambda _: True))

+                   depends_if('--enable-elf-hack')(lambda _: False))

 @depends(check_build_environment)