diff --git a/caps/nsScriptSecurityManager.cpp b/caps/nsScriptSecurityManager.cpp
index 8beb23e44..790483e25 100644
--- a/caps/nsScriptSecurityManager.cpp
+++ b/caps/nsScriptSecurityManager.cpp
@@ -700,7 +700,7 @@ nsScriptSecurityManager::CheckLoadURIWithPrincipal(nsIPrincipal* aPrincipal,
             if (0 ||
 
 #ifdef __ppc__
-                BLOC("static.twitchcdn.net") ||
+                /* No sites in blocklist currently */
 #endif // __ppc__
 
                     0) {
diff --git a/dom/workers/WorkerThread.cpp b/dom/workers/WorkerThread.cpp
index 40b617883..f45600f84 100644
--- a/dom/workers/WorkerThread.cpp
+++ b/dom/workers/WorkerThread.cpp
@@ -24,9 +24,13 @@ using namespace mozilla::ipc;
 
 namespace {
 
-// The C stack size. We use the same stack size on all platforms for
-// consistency.
+// The C stack size.
+#ifdef __ppc__
+// TenFourFox issue 607.
+const uint32_t kWorkerStackSize = 16384 * sizeof(size_t) * 1024;
+#else
 const uint32_t kWorkerStackSize = 256 * sizeof(size_t) * 1024;
+#endif
 
 } // namespace