--- firefox-68.0/js/src/wasm/WasmSignalHandlers.cpp
+++ firefox-68.0/js/src/wasm/WasmSignalHandlers.cpp
@@ -243,7 +243,7 @@
 // If you run into compile problems on a tier-3 platform, you can disable the
 // emulation here.

-#if defined(__linux__) && defined(__arm__)
+#if 0 && defined(__linux__) && defined(__arm__)
 #  define WASM_EMULATE_ARM_UNALIGNED_FP_ACCESS
 #endif