--- a/testing/mozharness/configs/unittests/win_taskcluster_unittest.py
+++ b/testing/mozharness/configs/unittests/win_taskcluster_unittest.py
@@ -171,17 +171,16 @@ config = {
         "browser-chrome-clipboard": ["--flavor=browser", "--subsuite=clipboard"],
         "browser-chrome-chunked": ["--flavor=browser", "--chunk-by-runtime"],
         "browser-chrome-addons": ["--flavor=browser", "--chunk-by-runtime", "--tag=addons"],
         "browser-chrome-screenshots": ["--flavor=browser", "--subsuite=screenshots"],
         "browser-chrome-instrumentation": ["--flavor=browser"],
         "mochitest-gl": ["--subsuite=webgl"],
         "mochitest-devtools-chrome": ["--flavor=browser", "--subsuite=devtools"],
         "mochitest-devtools-chrome-chunked": ["--flavor=browser", "--subsuite=devtools", "--chunk-by-runtime"],
-        "mochitest-metro-chrome": ["--flavor=browser", "--metro-immersive"],
         "a11y": ["--flavor=a11y"],
     },
     # local reftest suites
     "all_reftest_suites": {
         "crashtest": {
             'options': ["--suite=crashtest"],
             'tests': ["tests/reftest/tests/testing/crashtest/crashtests.list"]
         },

--- a/testing/mozharness/configs/unittests/win_unittest.py
+++ b/testing/mozharness/configs/unittests/win_unittest.py
@@ -163,17 +163,16 @@ config = {
         "browser-chrome-clipboard": ["--flavor=browser", "--subsuite=clipboard"],
         "browser-chrome-chunked": ["--flavor=browser", "--chunk-by-runtime"],
         "browser-chrome-addons": ["--flavor=browser", "--chunk-by-runtime", "--tag=addons"],
         "browser-chrome-screenshots": ["--flavor=browser", "--subsuite=screenshots"],
         "browser-chrome-instrumentation": ["--flavor=browser"],
         "mochitest-gl": ["--subsuite=webgl"],
         "mochitest-devtools-chrome": ["--flavor=browser", "--subsuite=devtools"],
         "mochitest-devtools-chrome-chunked": ["--flavor=browser", "--subsuite=devtools", "--chunk-by-runtime"],
-        "mochitest-metro-chrome": ["--flavor=browser", "--metro-immersive"],
         "a11y": ["--flavor=a11y"],
     },
     # local reftest suites
     "all_reftest_suites": {
         "crashtest": {
             'options': ["--suite=crashtest"],
             'tests': ["tests/reftest/tests/testing/crashtest/crashtests.list"]
         },