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diff -up firefox-52.6.0esr/js/src/vm/Runtime.cpp.disable-extra-threads firefox-52.6.0esr/js/src/vm/Runtime.cpp
--- firefox-52.6.0esr/js/src/vm/Runtime.cpp.disable-extra-threads 2018-02-08 10:16:13.453828939 -0500
+++ firefox-52.6.0esr/js/src/vm/Runtime.cpp 2018-02-08 10:23:31.283458826 -0500
@@ -283,6 +283,17 @@ JSRuntime::init(uint32_t maxbytes, uint3
ownerThreadNative_ = (size_t)pthread_self();
#endif
+ const char* enable_js_helper_threads;
+ enable_js_helper_threads = getenv("GJS_ENABLE_JS_HELPER_THREADS");
+
+#if defined(__PPC64__) && defined (__LITTLE_ENDIAN__)
+ if (enable_js_helper_threads == NULL)
+ js::DisableExtraThreads();
+#endif
+
+ if (enable_js_helper_threads != NULL && enable_js_helper_threads[0] == '0')
+ js::DisableExtraThreads();
+
if (!mainThread.init())
return false;