diff --git a/old-configure.in b/old-configure.in
index 027c9447ec..79450a6d72 100644
--- a/old-configure.in
+++ b/old-configure.in
@@ -2245,7 +2245,6 @@ MOZ_INSTALL_TRACKING=
 ACCESSIBILITY=1
 MOZ_TIME_MANAGER=
 MOZ_AUDIO_CHANNEL_MANAGER=
-MOZ_BINARY_EXTENSIONS=
 MOZ_JETPACK=1
 MOZ_DEVTOOLS_SERVER=1
 MOZ_DEVTOOLS=
@@ -5225,10 +5224,6 @@ AC_SUBST(MOZ_FIX_LINK_PATHS)
 AC_SUBST(MOZ_POST_PROGRAM_COMMAND)
 AC_SUBST(MOZ_LINKER_EXTRACT)
 
-if test -n "$MOZ_BINARY_EXTENSIONS"; then
-  AC_DEFINE(MOZ_BINARY_EXTENSIONS)
-fi
-
 AC_SUBST(MOZ_ADDON_SIGNING)
 if test "$MOZ_ADDON_SIGNING" = 1; then
   AC_DEFINE(MOZ_ADDON_SIGNING)
diff --git a/xpcom/components/ManifestParser.cpp b/xpcom/components/ManifestParser.cpp
index 4dcfc8402c..7188c0ec5d 100644
--- a/xpcom/components/ManifestParser.cpp
+++ b/xpcom/components/ManifestParser.cpp
@@ -637,14 +637,6 @@ ParseManifest(NSLocationType aType, FileLocation& aFile, char* aBuf,
       continue;
     }
 
-#ifndef MOZ_BINARY_EXTENSIONS
-    if (directive->apponly && NS_APP_LOCATION != aType) {
-      LogMessageWithContext(aFile, line,
-                            "Only application manifests may use the '%s' directive.", token);
-      continue;
-    }
-#endif
-
     if (directive->componentonly && NS_SKIN_LOCATION == aType) {
       LogMessageWithContext(aFile, line,
                             "Skin manifest not allowed to use '%s' directive.",