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diff -up firefox-68.1.0/xpcom/threads/nsThread.cpp.old firefox-68.1.0/xpcom/threads/nsThread.cpp
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--- firefox-68.1.0/xpcom/threads/nsThread.cpp.old	2019-09-20 12:17:35.481661390 +0200
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+++ firefox-68.1.0/xpcom/threads/nsThread.cpp	2019-09-20 12:19:14.269180516 +0200
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@@ -556,7 +556,8 @@ void nsThread::InitCommon() {
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     // kernel report them as separate regions, even when they are adjacent to
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     // heap memory. This allows us to accurately track the actual memory
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     // consumption of our allocated stacks.
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-    madvise(mStackBase, stackSize, MADV_NOHUGEPAGE);
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+    // not supported on RHEL6
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+    // madvise(mStackBase, stackSize, MADV_NOHUGEPAGE);
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     pthread_attr_destroy(&attr);
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 #elif defined(XP_WIN)