diff --git a/MozillaThunderbird.changes b/MozillaThunderbird.changes
index 0a38aa7..4eae77f 100644
--- a/MozillaThunderbird.changes
+++ b/MozillaThunderbird.changes
@@ -1,3 +1,9 @@
+-------------------------------------------------------------------
+Tue Jun  4 20:41:42 UTC 2013 - dvaleev@suse.com
+
+- prevent xpc-shell crashing on powerpc
+  ppc-xpcshell.patch 
+
 -------------------------------------------------------------------
 Sat May 11 08:46:37 UTC 2013 - wr@rosenauer.org
 
diff --git a/MozillaThunderbird.spec b/MozillaThunderbird.spec
index c8bfbb7..6881d70 100644
--- a/MozillaThunderbird.spec
+++ b/MozillaThunderbird.spec
@@ -76,6 +76,7 @@ Patch3:         mozilla-nongnome-proxies.patch
 Patch4:         mozilla-kde.patch
 Patch5:         mozilla-arm-disable-edsp.patch
 Patch7:         mozilla-ppc.patch
+Patch8:         ppc-xpcshell.patch
 # SLE11 patches
 Patch10:        mozilla-gcc43-enums.patch
 Patch11:        mozilla-gcc43-template_hacks.patch
@@ -208,6 +209,7 @@ pushd mozilla
 %endif
 %patch5 -p1
 %patch7 -p1
+%patch8 -p1
 # SLE patches
 %if %suse_version <= 1110
 %patch10 -p1
diff --git a/ppc-xpcshell.patch b/ppc-xpcshell.patch
new file mode 100644
index 0000000..b399afc
--- /dev/null
+++ b/ppc-xpcshell.patch
@@ -0,0 +1,71 @@
+Index: mozilla/js/src/gc/Heap.h
+===================================================================
+--- mozilla.orig/js/src/gc/Heap.h
++++ mozilla/js/src/gc/Heap.h
+@@ -110,19 +110,22 @@ struct Cell
+  */
+ #if defined(SOLARIS) && (defined(__sparc) || defined(__sparcv9))
+ const size_t PageShift = 13;
++const size_t ArenaShift = PageShift;
++#elif defined(__powerpc__)
++const size_t PageShift = 16;
++const size_t ArenaShift = 12;
+ #else
+ const size_t PageShift = 12;
++const size_t ArenaShift = PageShift;
+ #endif
+ const size_t PageSize = size_t(1) << PageShift;
++const size_t ArenaSize = size_t(1) << ArenaShift;
++const size_t ArenaMask = ArenaSize - 1;
+ 
+ const size_t ChunkShift = 20;
+ const size_t ChunkSize = size_t(1) << ChunkShift;
+ const size_t ChunkMask = ChunkSize - 1;
+ 
+-const size_t ArenaShift = PageShift;
+-const size_t ArenaSize = PageSize;
+-const size_t ArenaMask = ArenaSize - 1;
+-
+ /*
+  * This is the maximum number of arenas we allow in the FreeCommitted state
+  * before we trigger a GC_SHRINK to release free arenas to the OS.
+Index: mozilla/js/src/gc/Memory.cpp
+===================================================================
+--- mozilla.orig/js/src/gc/Memory.cpp
++++ mozilla/js/src/gc/Memory.cpp
+@@ -15,6 +15,15 @@
+ namespace js {
+ namespace gc {
+ 
++/* Unused memory decommiting requires the arena size match the page size. */
++extern const size_t PageSize;
++extern const size_t ArenaSize;
++static bool
++DecommitEnabled()
++{
++    return PageSize == ArenaSize;
++}
++
+ #if defined(XP_WIN)
+ #include "jswin.h"
+ #include <psapi.h>
+@@ -83,6 +92,9 @@ UnmapPages(void *p, size_t size)
+ bool
+ MarkPagesUnused(void *p, size_t size)
+ {
++    if (!DecommitEnabled())
++        return false;
++
+     JS_ASSERT(uintptr_t(p) % PageSize == 0);
+     LPVOID p2 = VirtualAlloc(p, size, MEM_RESET, PAGE_READWRITE);
+     return p2 == p;
+@@ -352,6 +364,9 @@ UnmapPages(void *p, size_t size)
+ bool
+ MarkPagesUnused(void *p, size_t size)
+ {
++    if (!DecommitEnabled())
++        return false;
++
+     JS_ASSERT(uintptr_t(p) % PageSize == 0);
+     int result = madvise(p, size, MADV_DONTNEED);
+     return result != -1;