diff -up firefox-48.0/js/src/jit/AtomicOperations.h.old firefox-48.0/js/src/jit/AtomicOperations.h
--- firefox-48.0/js/src/jit/AtomicOperations.h.old	2016-07-27 09:42:43.148175449 +0200
+++ firefox-48.0/js/src/jit/AtomicOperations.h	2016-07-27 09:41:13.000000000 +0200
@@ -340,7 +340,7 @@ AtomicOperations::isLockfree(int32_t siz
 # elif defined(__aarch64__)
 #  include "jit/arm64/AtomicOperations-arm64.h"
 # else
-#  include "jit/none/AtomicOperations-none.h" // These MOZ_CRASH() always
+#  include "jit/none/AtomicOperations-ppc.h"
 # endif
 #elif defined(JS_CODEGEN_X86) || defined(JS_CODEGEN_X64)
 # include "jit/x86-shared/AtomicOperations-x86-shared.h"