diff -up firefox-53.0/layout/base/nsIPresShell.h.1354671 firefox-53.0/layout/base/nsIPresShell.h

--- firefox-53.0/layout/base/nsIPresShell.h.1354671	2017-04-27 13:07:43.808653320 +0200

+++ firefox-53.0/layout/base/nsIPresShell.h	2017-04-27 13:09:40.404427641 +0200

@@ -212,7 +212,7 @@ public:

    * to the same aSize value.  AllocateFrame is infallible and will abort

    * on out-of-memory.

    */

-  void* AllocateFrame(nsQueryFrame::FrameIID aID, size_t aSize)

+  void* __attribute__((optimize("no-lifetime-dse"))) AllocateFrame(nsQueryFrame::FrameIID aID, size_t aSize)

   {

     void* result = mFrameArena.AllocateByFrameID(aID, aSize);

     RecordAlloc(result);