diff --git a/layout/tools/reftest/Makefile.in b/layout/tools/reftest/Makefile.in
deleted file mode 100644
index 1baf9594bc2b..000000000000
--- a/layout/tools/reftest/Makefile.in
+++ /dev/null
@@ -1,14 +0,0 @@
-# vim: set shiftwidth=8 tabstop=8 autoindent noexpandtab copyindent:
-# This Source Code Form is subject to the terms of the Mozilla Public
-# License, v. 2.0. If a copy of the MPL was not distributed with this
-# file, You can obtain one at http://mozilla.org/MPL/2.0/.
-
-_DEST_DIR = $(DEPTH)/_tests/reftest
-
-include $(topsrcdir)/config/rules.mk
-
-# copy harness and the reftest extension bits to $(_DEST_DIR)
-# This needs to happen after jar.mn handling from rules.mk included above.
-# The order of the :: rules ensures that.
-libs::
-	(cd $(DIST)/xpi-stage && tar $(TAR_CREATE_FLAGS) - reftest) | (cd $(_DEST_DIR) && tar -xf -)
diff --git a/layout/tools/reftest/reftestcommandline.py b/layout/tools/reftest/reftestcommandline.py
index 3e49b25b4997..96727b43c6fa 100644
--- a/layout/tools/reftest/reftestcommandline.py
+++ b/layout/tools/reftest/reftestcommandline.py
@@ -313,8 +313,8 @@ class ReftestArgumentsParser(argparse.ArgumentParser):
 
         if options.reftestExtensionPath is None:
             if self.build_obj is not None:
-                reftestExtensionPath = os.path.join(self.build_obj.topobjdir, "_tests",
-                                                    "reftest", "reftest")
+                reftestExtensionPath = os.path.join(self.build_obj.distdir,
+                                                    "xpi-stage", "reftest")
             else:
                 reftestExtensionPath = os.path.join(here, "reftest")
             options.reftestExtensionPath = os.path.normpath(reftestExtensionPath)
@@ -322,8 +322,8 @@ class ReftestArgumentsParser(argparse.ArgumentParser):
         if (options.specialPowersExtensionPath is None and
             options.suite in ["crashtest", "jstestbrowser"]):
             if self.build_obj is not None:
-                specialPowersExtensionPath = os.path.join(self.build_obj.topobjdir, "_tests",
-                                                          "reftest", "specialpowers")
+                specialPowersExtensionPath = os.path.join(self.build_obj.distdir,
+                                                          "xpi-stage", "specialpowers")
             else:
                 specialPowersExtensionPath = os.path.join(here, "specialpowers")
             options.specialPowersExtensionPath = os.path.normpath(specialPowersExtensionPath)
diff --git a/python/mozbuild/mozbuild/action/test_archive.py b/python/mozbuild/mozbuild/action/test_archive.py
index a5b01e710a94..df19d5a54f03 100644
--- a/python/mozbuild/mozbuild/action/test_archive.py
+++ b/python/mozbuild/mozbuild/action/test_archive.py
@@ -409,7 +409,19 @@ ARCHIVE_FILES = {
                 'testing/crashtest/crashtests.list',
             ],
             'dest': 'reftest/tests',
-        }
+        },
+        {
+            'source': buildconfig.topobjdir,
+            'base': 'dist/xpi-stage',
+            'pattern': 'reftest/**',
+            'dest': 'reftest'
+        },
+        {
+            'source': buildconfig.topobjdir,
+            'base': 'dist/xpi-stage',
+            'pattern': 'specialpowers/**',
+            'dest': 'reftest'
+        },
     ],
     'talos': [
         {
diff --git a/testing/specialpowers/Makefile.in b/testing/specialpowers/Makefile.in
index edf6cad53121..e42d0650efbe 100644
--- a/testing/specialpowers/Makefile.in
+++ b/testing/specialpowers/Makefile.in
@@ -3,16 +3,4 @@
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
-TEST_EXTENSIONS_DIR = $(DEPTH)/testing/specialpowers
 XPI_PKGNAME = specialpowers@mozilla.org
-
-include $(topsrcdir)/config/rules.mk
-
-libs-preqs = \
-  $(call mkdir_deps,$(TEST_EXTENSIONS_DIR)) \
-  $(NULL)
-
-libs:: $(libs-preqs)
-	(cd $(DIST)/xpi-stage && tar $(TAR_CREATE_FLAGS) - $(XPI_NAME)) | (cd $(TEST_EXTENSIONS_DIR) && tar -xf -)
-	$(NSINSTALL) -D $(DEPTH)/_tests/reftest/specialpowers
-	cp -RL $(DEPTH)/testing/specialpowers/specialpowers $(DEPTH)/_tests/reftest