--- a/python/mozbuild/mozbuild/action/test_archive.py
+++ b/python/mozbuild/mozbuild/action/test_archive.py
@@ -54,16 +54,21 @@ ARCHIVE_FILES = {
         },
         {
             'source': buildconfig.topsrcdir,
             'base': 'testing',
             'pattern': 'firefox-ui/**',
         },
         {
             'source': buildconfig.topsrcdir,
+            'base': 'dom/media/test',
+            'pattern': 'external-media-tests/**',
+        },
+        {
+            'source': buildconfig.topsrcdir,
             'base': 'js/src',
             'pattern': 'jit-test/**',
             'dest': 'jit-test',
         },
         {
             'source': buildconfig.topsrcdir,
             'base': 'js/src/tests',
             'pattern': 'ecma_6/**',