--- a/testing/mozharness/mozharness/mozilla/testing/errors.py
+++ b/testing/mozharness/mozharness/mozilla/testing/errors.py
@@ -27,16 +27,22 @@ from mozharness.base.log import INFO, WA
 
 TinderBoxPrintRe = {
     "mochitest_summary": _mochitest_summary,
     "mochitest-chrome_summary": _mochitest_summary,
     "mochitest-gl_summary": _mochitest_summary,
     "mochitest-media_summary": _mochitest_summary,
     "mochitest-plain-clipboard_summary": _mochitest_summary,
     "mochitest-plain-gpu_summary": _mochitest_summary,
+    "marionette_summary": {
+        'regex': re.compile(r'''(passed|failed|todo):\ +(\d+)'''),
+        'pass_group': "passed",
+        'fail_group': "failed",
+        'known_fail_group': "todo",
+    },
     "reftest_summary": {
         'regex': re.compile(r'''REFTEST INFO \| (Successful|Unexpected|Known problems): (\d+) \('''),
         'pass_group': "Successful",
         'fail_group': "Unexpected",
         'known_fail_group': "Known problems",
     },
     "crashtest_summary": {
         'regex': re.compile(r'''REFTEST INFO \| (Successful|Unexpected|Known problems): (\d+) \('''),