diff -up firefox-60.5.0/memory/build/mozjemalloc.cpp.jemalloc-ppc firefox-60.5.0/memory/build/mozjemalloc.cpp
--- firefox-60.5.0/memory/build/mozjemalloc.cpp.jemalloc-ppc	2019-01-22 10:25:30.764207480 +0100
+++ firefox-60.5.0/memory/build/mozjemalloc.cpp	2019-01-22 10:28:48.352235343 +0100
@@ -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