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
@@ -1322,7 +1322,7 @@
             help="{Enable|Disable} elf hacks",
         )
 
-        set_config("USE_ELF_HACK", depends_if("--enable-elf-hack")(lambda _: True))
+        set_config("USE_ELF_HACK", depends_if("--enable-elf-hack")(lambda _: False))
 
 
 @depends(check_build_environment)