diff -up firefox-60.0/memory/build/mozjemalloc.cpp.ppc-jemalloc firefox-60.0/memory/build/mozjemalloc.cpp

--- firefox-60.0/memory/build/mozjemalloc.cpp.ppc-jemalloc	2018-06-06 14:39:28.454371053 +0200

+++ firefox-60.0/memory/build/mozjemalloc.cpp	2018-06-06 14:39:40.242397928 +0200

@@ -180,7 +180,7 @@ using namespace mozilla;

 // Debug builds are opted out too, for test coverage.

 #ifndef MOZ_DEBUG

 #if !defined(__ia64__) && !defined(__sparc__) && !defined(__mips__) &&         \

-  !defined(__aarch64__)

+  !defined(__aarch64__) && !defined(__powerpc__)

 #define MALLOC_STATIC_PAGESIZE 1

 #endif

 #endif