diff --git a/gfx/webrender_bindings/Moz2DImageRenderer.cpp b/gfx/webrender_bindings/Moz2DImageRenderer.cpp
index 2901ddb6e3221..585777bd569c0 100644
--- a/gfx/webrender_bindings/Moz2DImageRenderer.cpp
+++ b/gfx/webrender_bindings/Moz2DImageRenderer.cpp
@@ -14,7 +14,6 @@
 #include "WebRenderTypes.h"
 #include "webrender_ffi.h"
 
-#include <iostream>
 #include <unordered_map>
 
 #ifdef XP_MACOSX
diff --git a/layout/base/nsLayoutDebugger.cpp b/layout/base/nsLayoutDebugger.cpp
index 4e705f65489fb..ba6dd94c86378 100644
--- a/layout/base/nsLayoutDebugger.cpp
+++ b/layout/base/nsLayoutDebugger.cpp
@@ -17,7 +17,6 @@
 #include "FrameLayerBuilder.h"
 #include "nsPrintfCString.h"
 
-#include <iostream>
 #include <stdio.h>
 
 using namespace mozilla;
@@ -267,7 +266,7 @@ PrintDisplayItemToStdout(nsDisplayListBuilder* aBuilder, nsDisplayItem* aItem)
 {
   std::stringstream stream;
   PrintDisplayItemTo(aBuilder, aItem, stream, 0, true, false);
-  std::cout << stream.str() << std::endl;
+  puts(stream.str().c_str());
 }
 
 void
@@ -275,7 +274,7 @@ PrintDisplayListToStdout(nsDisplayListBuilder* aBuilder, const nsDisplayList& aL
 {
   std::stringstream stream;
   PrintDisplayListTo(aBuilder, aList, stream, 0, false);
-  std::cout << stream.str() << std::endl;
+  puts(stream.str().c_str());
 }
 
 #ifdef MOZ_DUMP_PAINTING
diff --git a/media/webrtc/signaling/src/media-conduit/WebrtcGmpVideoCodec.cpp b/media/webrtc/signaling/src/media-conduit/WebrtcGmpVideoCodec.cpp
index d6e0691754ca1..6cd4a1e1e2002 100644
--- a/media/webrtc/signaling/src/media-conduit/WebrtcGmpVideoCodec.cpp
+++ b/media/webrtc/signaling/src/media-conduit/WebrtcGmpVideoCodec.cpp
@@ -4,7 +4,6 @@
 
 #include "WebrtcGmpVideoCodec.h"
 
-#include <iostream>
 #include <vector>
 
 #include "mozilla/CheckedInt.h"
diff --git a/media/webrtc/signaling/src/media-conduit/WebrtcGmpVideoCodec.h b/media/webrtc/signaling/src/media-conduit/WebrtcGmpVideoCodec.h
index e4f60541d5f6a..0f125d0b311ad 100644
--- a/media/webrtc/signaling/src/media-conduit/WebrtcGmpVideoCodec.h
+++ b/media/webrtc/signaling/src/media-conduit/WebrtcGmpVideoCodec.h
@@ -33,7 +33,6 @@
 #ifndef WEBRTCGMPVIDEOCODEC_H_
 #define WEBRTCGMPVIDEOCODEC_H_
 
-#include <iostream>
 #include <queue>
 #include <string>
 
diff --git a/media/webrtc/signaling/src/media-conduit/WebrtcMediaCodecVP8VideoCodec.cpp b/media/webrtc/signaling/src/media-conduit/WebrtcMediaCodecVP8VideoCodec.cpp
index e5148e1a99069..95db44b6f1b34 100644
--- a/media/webrtc/signaling/src/media-conduit/WebrtcMediaCodecVP8VideoCodec.cpp
+++ b/media/webrtc/signaling/src/media-conduit/WebrtcMediaCodecVP8VideoCodec.cpp
@@ -3,7 +3,6 @@
  * You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 #include <cstdio>
-#include <iostream>
 #include <queue>
 
 #include "CSFLog.h"
diff --git a/security/sandbox/chromium-shim/sandbox/win/loggingCallbacks.h b/security/sandbox/chromium-shim/sandbox/win/loggingCallbacks.h
index 69491d057b650..d70c9efa1f6ae 100644
--- a/security/sandbox/chromium-shim/sandbox/win/loggingCallbacks.h
+++ b/security/sandbox/chromium-shim/sandbox/win/loggingCallbacks.h
@@ -8,7 +8,6 @@
 #define security_sandbox_loggingCallbacks_h__
 
 #include <sstream>
-#include <iostream>
 
 #include "mozilla/Logging.h"
 #include "mozilla/Preferences.h"