--- a/testing/mozharness/configs/single_locale/tc_linux32.py
+++ b/testing/mozharness/configs/single_locale/tc_linux32.py
@@ -7,16 +7,15 @@ config = {
     "tools_repo": "https://hg.mozilla.org/build/tools",
     "bootstrap_env": {
         "NO_MERCURIAL_SETUP_CHECK": "1",
         "MOZ_OBJDIR": "obj-firefox",
         "EN_US_BINARY_URL": os.environ.get("EN_US_BINARY_URL", EN_US_BINARY_URL),
         "MOZ_UPDATE_CHANNEL": "%(update_channel)s",
         "DIST": "%(abs_objdir)s",
         "L10NBASEDIR": "../../l10n",
-        "MOZ_MAKE_COMPLETE_MAR": "1",
         'TOOLTOOL_CACHE': os.environ.get('TOOLTOOL_CACHE'),
     },
     "upload_env": {
         'UPLOAD_HOST': 'localhost',
         'UPLOAD_PATH': '/builds/worker/artifacts/',
     },
 }

--- a/testing/mozharness/configs/single_locale/tc_linux64.py
+++ b/testing/mozharness/configs/single_locale/tc_linux64.py
@@ -7,16 +7,15 @@ config = {
     "tools_repo": "https://hg.mozilla.org/build/tools",
     "bootstrap_env": {
         "NO_MERCURIAL_SETUP_CHECK": "1",
         "MOZ_OBJDIR": "obj-firefox",
         "EN_US_BINARY_URL": os.environ.get("EN_US_BINARY_URL", EN_US_BINARY_URL),
         "MOZ_UPDATE_CHANNEL": "%(update_channel)s",
         "DIST": "%(abs_objdir)s",
         "L10NBASEDIR": "../../l10n",
-        "MOZ_MAKE_COMPLETE_MAR": "1",
         'TOOLTOOL_CACHE': os.environ.get('TOOLTOOL_CACHE'),
     },
     "upload_env": {
         'UPLOAD_HOST': 'localhost',
         'UPLOAD_PATH': '/builds/worker/artifacts/',
     },
 }

--- a/testing/mozharness/configs/single_locale/tc_macosx64.py
+++ b/testing/mozharness/configs/single_locale/tc_macosx64.py
@@ -7,17 +7,16 @@ config = {
     "tools_repo": "https://hg.mozilla.org/build/tools",
     "bootstrap_env": {
         "NO_MERCURIAL_SETUP_CHECK": "1",
         "MOZ_OBJDIR": "obj-firefox",
         "EN_US_BINARY_URL": os.environ.get("EN_US_BINARY_URL", EN_US_BINARY_URL),
         "MOZ_UPDATE_CHANNEL": "%(update_channel)s",
         "DIST": "%(abs_objdir)s",
         "L10NBASEDIR": "../../l10n",
-        "MOZ_MAKE_COMPLETE_MAR": "1",
         'TOOLTOOL_CACHE': os.environ.get('TOOLTOOL_CACHE'),
     },
     "upload_env": {
         'UPLOAD_HOST': 'localhost',
         'UPLOAD_PATH': '/builds/worker/artifacts/',
     },
 
     "tooltool_url": 'http://relengapi/tooltool/',

--- a/testing/mozharness/configs/single_locale/tc_win32.py
+++ b/testing/mozharness/configs/single_locale/tc_win32.py
@@ -12,17 +12,16 @@ config = {
         "EN_US_BINARY_URL": os.environ.get("EN_US_BINARY_URL", EN_US_BINARY_URL),
         # EN_US_INSTALLER_BINARY_URL falls back on EN_US_BINARY_URL
         "EN_US_INSTALLER_BINARY_URL": os.environ.get(
             "EN_US_INSTALLER_BINARY_URL", os.environ.get(
                 "EN_US_BINARY_URL", EN_US_BINARY_URL)),
         "MOZ_UPDATE_CHANNEL": "%(update_channel)s",
         "DIST": "%(abs_objdir)s",
         "L10NBASEDIR": "../../l10n",
-        "MOZ_MAKE_COMPLETE_MAR": "1",
         'TOOLTOOL_CACHE': os.environ.get('TOOLTOOL_CACHE', 'c:/builds/tooltool_cache'),
         'EN_US_PACKAGE_NAME': 'target.zip',
         'EN_US_PKG_INST_BASENAME': 'target.installer',
     },
     "upload_env": {
         'UPLOAD_HOST': 'localhost',
         'UPLOAD_PATH': os.path.join(os.getcwd(), 'public', 'build'),
     },

--- a/testing/mozharness/configs/single_locale/tc_win64.py
+++ b/testing/mozharness/configs/single_locale/tc_win64.py
@@ -12,17 +12,16 @@ config = {
         "EN_US_BINARY_URL": os.environ.get("EN_US_BINARY_URL", EN_US_BINARY_URL),
         # EN_US_INSTALLER_BINARY_URL falls back on EN_US_BINARY_URL
         "EN_US_INSTALLER_BINARY_URL": os.environ.get(
             "EN_US_INSTALLER_BINARY_URL", os.environ.get(
                 "EN_US_BINARY_URL", EN_US_BINARY_URL)),
         "MOZ_UPDATE_CHANNEL": "%(update_channel)s",
         "DIST": "%(abs_objdir)s",
         "L10NBASEDIR": "../../l10n",
-        "MOZ_MAKE_COMPLETE_MAR": "1",
         'TOOLTOOL_CACHE': os.environ.get('TOOLTOOL_CACHE', 'c:/builds/tooltool_cache'),
         'EN_US_PACKAGE_NAME': 'target.zip',
         'EN_US_PKG_INST_BASENAME': 'target.installer',
     },
     "upload_env": {
         'UPLOAD_HOST': 'localhost',
         'UPLOAD_PATH': os.path.join(os.getcwd(), 'public', 'build'),
     },