--- a/taskcluster/ci/test/reftest.yml
+++ b/taskcluster/ci/test/reftest.yml
@@ -87,29 +87,28 @@ jsreftest:
             linux64-qr/.*: 1
             windows10-64-asan.*: 3
             default: default
 
 reftest:
     description: "Reftest run"
     suite: reftest/reftest
     treeherder-symbol: R(R)
-    worker-type:
-        by-test-platform:
-            windows10-64.*: buildbot-bridge/buildbot-bridge
-            default: null
     run-on-projects:
         by-test-platform:
             .*-qr/.*: ['trunk', 'try']  # exclude beta and project branches
             default: built-projects
     instance-size:
         by-test-platform:
             android.*: xlarge
             default: default
-    virtualization: virtual-with-gpu
+    virtualization:
+        by-test-platform:
+            windows10.*: hardware
+            default: virtual-with-gpu
     chunks:
         by-test-platform:
             android-4.3-arm7-api-16/debug: 56
             android.*: 28
             macosx64.*/opt: 1
             macosx64.*/debug: 3
             windows10-64.*/opt: 1
             windows10-64.*/debug: 2

--- a/testing/mozharness/configs/unittests/win_taskcluster_unittest.py
+++ b/testing/mozharness/configs/unittests/win_taskcluster_unittest.py
@@ -123,16 +123,17 @@ config = {
                 "--appname=%(binary_path)s",
                 "--utility-path=tests/bin",
                 "--extra-profile-file=tests/bin/plugins",
                 "--symbols-path=%(symbols_path)s",
                 "--log-raw=%(raw_log_file)s",
                 "--log-errorsummary=%(error_summary_file)s",
                 "--cleanup-crashes",
                 "--marionette-startup-timeout=180",
+                "--sandbox-read-whitelist=%(abs_work_dir)s",
             ],
             "run_filename": "runreftest.py",
             "testsdir": "reftest"
         },
         "xpcshell": {
             "options": [
                 "--symbols-path=%(symbols_path)s",
                 "--test-plugin-path=%(test_plugin_path)s",