diff --git a/modules/libpref/init/all.js b/modules/libpref/init/all.js
index f4dbc74575..2e70ad5f06 100644
--- a/modules/libpref/init/all.js
+++ b/modules/libpref/init/all.js
@@ -1265,8 +1265,14 @@ pref("javascript.options.unboxed_objects",  false);
 pref("javascript.options.baselinejit",      true);
 pref("javascript.options.ion",              true);
 pref("javascript.options.asmjs",            true);
-pref("javascript.options.wasm",             false);
+pref("javascript.options.wasm",             true);
+// wasm jit crashes in 32bit builds because of 64bit casts so
+// only enable it by default for 64bit builds
+#ifdef HAVE_64BIT_BUILD
+pref("javascript.options.wasm_baselinejit", true);
+#else
 pref("javascript.options.wasm_baselinejit", false);
+#endif
 pref("javascript.options.native_regexp",    true);
 pref("javascript.options.parallel_parsing", true);
 // ayncstack is used for debugging promises in devtools.