--- a/mozilla/b2g_config.py
+++ b/mozilla/b2g_config.py
@@ -548,16 +548,17 @@ PLATFORM_VARS = {
     },
     'macosx64-mulet': {
         'product_name': 'firefox',
         'mozharness_desktop_build': {
             'script_name': 'scripts/fx_desktop_build.py',
             'extra_args': [
                 '--config', 'builds/releng_base_mac_64_builds.py',
                 '--custom-build-variant-cfg', 'mulet',
+                '--config', GLOBAL_VARS['mozharness_configs']['balrog'],
             ],
             'script_timeout': 3 * 3600,
             'script_maxtime': int(5.5 * 3600),
         },
         'multi_locale': False,
         'unittest_platform': 'macosx64-mulet-opt',
         'app_name': 'browser',
         'brand_name': 'Minefield',
@@ -815,16 +816,17 @@ PLATFORM_VARS = {
     'win32-mulet': {
         'product_name': 'firefox',
         'mozharness_python': ['c:/mozilla-build/python27/python', '-u'],
         'mozharness_desktop_build': {
             'script_name': 'scripts/fx_desktop_build.py',
             'extra_args': [
                 '--config', 'builds/releng_base_windows_32_builds.py',
                 '--custom-build-variant-cfg', 'mulet',
+                '--config', GLOBAL_VARS['mozharness_configs']['balrog'],
             ],
             'script_timeout': 3 * 3600,
             'script_maxtime': int(5.5 * 3600),
         },
         'app_name': 'browser',
         'base_name': 'Win32 Mulet %(branch)s',
         'mozconfig': 'in_tree',
         'src_mozconfig': 'b2g/dev/config/mozconfigs/win32/mulet',
@@ -1566,16 +1568,17 @@ PLATFORM_VARS = {
         ],
         "mozharness_repo_cache": "/tools/checkouts/mozharness",
         "tools_repo_cache": "/tools/checkouts/build-tools",
         "mozharness_desktop_build": {
             "script_name": "scripts/fx_desktop_build.py",
             "extra_args": [
                 "--config", "builds/releng_base_linux_64_builds.py",
                 "--custom-build-variant-cfg", "graphene"
+                '--config', GLOBAL_VARS['mozharness_configs']['balrog'],
             ],
             "script_timeout": 3 * 3600,
             "script_maxtime": int(5.5 * 3600),
         },
         "stage_product": "b2g",
         "base_name": "graphene_%(branch)s_linux64",
         "platform_objdir": OBJDIR,
         "slaves": SLAVES["mock"],
@@ -1585,16 +1588,17 @@ PLATFORM_VARS = {
         "mozharness_python": "/tools/buildbot/bin/python",
         "reboot_command": ["scripts/external_tools/count_and_reboot.py",
                            "-f", "../reboot_count.txt", "-n", "1", "-z"],
         "mozharness_desktop_build": {
             "script_name": "scripts/fx_desktop_build.py",
             "extra_args": [
                 "--config", "builds/releng_base_mac_64_builds.py",
                 "--custom-build-variant-cfg", "graphene"
+                '--config', GLOBAL_VARS['mozharness_configs']['balrog'],
             ],
             "script_timeout": 3 * 3600,
             "script_maxtime": int(5.5 * 3600),
         },
         "stage_product": "b2g",
         "base_name": "graphene_%(branch)s_macosx64",
         "platform_objdir": OBJDIR,
         "slaves": SLAVES["macosx64-lion"],
@@ -1607,16 +1611,17 @@ PLATFORM_VARS = {
             "scripts/external_tools/count_and_reboot.py",
             "-f", "../reboot_count.txt","-n", "1", "-z"
         ],
         "mozharness_desktop_build": {
             "script_name": "scripts/fx_desktop_build.py",
             "extra_args": [
                 "--config", "builds/releng_base_windows_64_builds.py",
                 "--custom-build-variant-cfg", "graphene"
+                '--config', GLOBAL_VARS['mozharness_configs']['balrog'],
             ],
             "script_timeout": 3 * 3600,
             "script_maxtime": int(5.5 * 3600),
         },
         "stage_product": "b2g",
         "base_name": "graphene_%(branch)s_win64",
         "platform_objdir": OBJDIR,
         "slaves": SLAVES["win64-rev2"],

--- a/mozilla/config.py
+++ b/mozilla/config.py
@@ -148,16 +148,17 @@ PLATFORM_VARS = {
                 '-f', '../reboot_count.txt', '-n', '1', '-z'
             ],
             'mozharness_repo_cache': '/tools/checkouts/mozharness',
             'tools_repo_cache': '/tools/checkouts/build-tools',
             'mozharness_desktop_build': {
                 'script_name': 'scripts/fx_desktop_build.py',
                 'extra_args': [
                     '--config', 'builds/releng_base_linux_32_builds.py',
+                    '--config', GLOBAL_VARS['mozharness_configs']['balrog'],
                 ],
                 'script_timeout': 3 * 3600,
                 'script_maxtime': int(5.5 * 3600),
             },
             'mozharness_desktop_l10n': {
                 'capable': True,
                 'scriptName': 'scripts/desktop_l10n.py',
                 'l10n_chunks': 3,
@@ -268,16 +269,17 @@ PLATFORM_VARS = {
                 '-f', '../reboot_count.txt', '-n', '1', '-z'
             ],
             'mozharness_repo_cache': '/tools/checkouts/mozharness',
             'tools_repo_cache': '/tools/checkouts/build-tools',
             'mozharness_desktop_build': {
                 'script_name': 'scripts/fx_desktop_build.py',
                 'extra_args': [
                     '--config', 'builds/releng_base_linux_64_builds.py',
+                    '--config', GLOBAL_VARS['mozharness_configs']['balrog'],
                 ],
                 'script_timeout': 3 * 3600,
                 'script_maxtime': int(5.5 * 3600),
             },
             'mozharness_desktop_l10n': {
                 'capable': True,
                 'scriptName': 'scripts/desktop_l10n.py',
                 'l10n_chunks': 3,
@@ -370,16 +372,17 @@ PLATFORM_VARS = {
             ],
             'mozharness_repo_cache': '/tools/checkouts/mozharness',
             'tools_repo_cache': '/tools/checkouts/build-tools',
             'mozharness_desktop_build': {
                 'script_name': 'scripts/fx_desktop_build.py',
                 'extra_args': [
                     '--config', 'builds/releng_base_linux_64_builds.py',
                     '--custom-build-variant-cfg', 'asan',
+                    '--config', GLOBAL_VARS['mozharness_configs']['balrog'],
                 ],
                 'script_timeout': 3 * 3600,
                 'script_maxtime': int(5.5 * 3600),
             },
 
             'product_name': 'firefox',
             'unittest_platform': 'linux64-asan-opt',
             'app_name': 'browser',
@@ -467,16 +470,17 @@ PLATFORM_VARS = {
             ],
             'mozharness_repo_cache': '/tools/checkouts/mozharness',
             'tools_repo_cache': '/tools/checkouts/build-tools',
             'mozharness_desktop_build': {
                 'script_name': 'scripts/fx_desktop_build.py',
                 'extra_args': [
                     '--config', 'builds/releng_base_linux_64_builds.py',
                     '--custom-build-variant-cfg', 'asan-and-debug',
+                    '--config', GLOBAL_VARS['mozharness_configs']['balrog'],
                 ],
                 'script_timeout': 3 * 3600,
                 'script_maxtime': int(5.5 * 3600),
             },
 
             'enable_nightly': True,
             'product_name': 'firefox',
             'unittest_platform': 'linux64-asan-debug',
@@ -565,16 +569,17 @@ PLATFORM_VARS = {
             ],
             'mozharness_repo_cache': '/tools/checkouts/mozharness',
             'tools_repo_cache': '/tools/checkouts/build-tools',
             'mozharness_desktop_build': {
                 'script_name': 'scripts/fx_desktop_build.py',
                 'extra_args': [
                     '--config', 'builds/releng_base_linux_64_builds.py',
                     '--custom-build-variant-cfg', 'stat-and-debug',
+                    '--config', GLOBAL_VARS['mozharness_configs']['balrog'],
                 ],
                 'script_timeout': 3 * 3600,
                 'script_maxtime': int(5.5 * 3600),
             },
 
             'enable_nightly': False,
             'product_name': 'firefox',
             'unittest_platform': 'linux64-st-an-debug',
@@ -712,16 +717,17 @@ PLATFORM_VARS = {
             'mozharness_python': '/tools/buildbot/bin/python',
             'reboot_command': ['scripts/external_tools/count_and_reboot.py',
                                '-f', '../reboot_count.txt', '-n', '1', '-z'],
             'mozharness_desktop_build': {
                 'script_name': 'scripts/fx_desktop_build.py',
                 'extra_args': [
                     '--config', 'builds/releng_base_linux_64_builds.py',
                     '--custom-build-variant-cfg', 'code-coverage',
+                    '--config', GLOBAL_VARS['mozharness_configs']['balrog'],
                 ],
                 'script_timeout': 3 * 3600,
                 'script_maxtime': int(5.5 * 3600),
             },
             'consider_for_nightly': False,
             'enable_nightly': False,
             'enable_xulrunner': False,
             'enable_opt_unittests': True,
@@ -800,16 +806,17 @@ PLATFORM_VARS = {
         'macosx64': {
             'mozharness_python': '/tools/buildbot/bin/python',
             'reboot_command': ['scripts/external_tools/count_and_reboot.py',
                                '-f', '../reboot_count.txt', '-n', '1', '-z'],
             'mozharness_desktop_build': {
                 'script_name': 'scripts/fx_desktop_build.py',
                 'extra_args': [
                     '--config', 'builds/releng_base_mac_64_builds.py',
+                    '--config', GLOBAL_VARS['mozharness_configs']['balrog'],
                 ],
                 'script_timeout': 3 * 3600,
                 'script_maxtime': int(5.5 * 3600),
             },
             'mozharness_desktop_l10n': {
                 'capable': True,
                 'scriptName': 'scripts/desktop_l10n.py',
                 'l10n_chunks': 3,
@@ -876,16 +883,17 @@ PLATFORM_VARS = {
                 'c:/mozilla-build/python27/python', '-u',
                 'scripts/external_tools/count_and_reboot.py',
                 '-f', '../reboot_count.txt','-n', '1', '-z'
             ],
             'mozharness_desktop_build': {
                 'script_name': 'scripts/fx_desktop_build.py',
                 'extra_args': [
                     '--config', 'builds/releng_base_windows_32_builds.py',
+                    '--config', GLOBAL_VARS['mozharness_configs']['balrog'],
                 ],
                 'script_timeout': 3 * 3600,
                 'script_maxtime': int(5.5 * 3600),
             },
             'mozharness_desktop_l10n': {
                 'capable': True,
                 'scriptName': 'scripts/desktop_l10n.py',
                 'l10n_chunks': 3,
@@ -945,16 +953,17 @@ PLATFORM_VARS = {
             'tooltool_script': ['python', '/c/mozilla-build/tooltool.py'],
         },
         'win64': {
             'mozharness_python': ['c:/mozilla-build/python27/python', '-u'],
             'mozharness_desktop_build': {
                 'script_name': 'scripts/fx_desktop_build.py',
                 'extra_args': [
                     '--config', 'builds/releng_base_windows_64_builds.py',
+                    '--config', GLOBAL_VARS['mozharness_configs']['balrog'],
                 ],
                 'script_timeout': 3 * 3600,
                 'script_maxtime': int(5.5 * 3600),
             },
             'mozharness_desktop_l10n': {
                 'capable': True,
                 'scriptName': 'scripts/desktop_l10n.py',
                 'l10n_chunks': 3,
@@ -1028,16 +1037,17 @@ PLATFORM_VARS = {
             ],
             'mozharness_repo_cache': '/tools/checkouts/mozharness',
             'tools_repo_cache': '/tools/checkouts/build-tools',
             'mozharness_desktop_build': {
                 'script_name': 'scripts/fx_desktop_build.py',
                 'extra_args': [
                     '--config', 'builds/releng_base_linux_32_builds.py',
                     '--custom-build-variant-cfg', 'debug',
+                    '--config', GLOBAL_VARS['mozharness_configs']['balrog'],
                 ],
                 'script_timeout': 3 * 3600,
                 'script_maxtime': int(5.5 * 3600),
             },
 
             'enable_nightly': False,
             'enable_xulrunner': False,
             'product_name': 'firefox',
@@ -1132,16 +1142,17 @@ PLATFORM_VARS = {
             ],
             'mozharness_repo_cache': '/tools/checkouts/mozharness',
             'tools_repo_cache': '/tools/checkouts/build-tools',
             'mozharness_desktop_build': {
                 'script_name': 'scripts/fx_desktop_build.py',
                 'extra_args': [
                     '--config', 'builds/releng_base_linux_64_builds.py',
                     '--custom-build-variant-cfg', 'debug',
+                    '--config', GLOBAL_VARS['mozharness_configs']['balrog'],
                 ],
                 'script_timeout': 3 * 3600,
                 'script_maxtime': int(5.5 * 3600),
             },
 
             'enable_nightly': False,
             'enable_xulrunner': False,
             'product_name': 'firefox',
@@ -1211,16 +1222,17 @@ PLATFORM_VARS = {
             'mozharness_python': '/tools/buildbot/bin/python',
             'reboot_command': ['scripts/external_tools/count_and_reboot.py',
                                '-f', '../reboot_count.txt', '-n', '1', '-z'],
             'mozharness_desktop_build': {
                 'script_name': 'scripts/fx_desktop_build.py',
                 'extra_args': [
                     '--config', 'builds/releng_base_mac_64_builds.py',
                     '--custom-build-variant-cfg', 'debug',
+                    '--config', GLOBAL_VARS['mozharness_configs']['balrog'],
                 ],
                 'script_timeout': 3 * 3600,
                 'script_maxtime': int(5.5 * 3600),
             },
 
             'enable_nightly': False,
             'enable_xulrunner': False,
             'product_name': 'firefox',
@@ -1268,16 +1280,17 @@ PLATFORM_VARS = {
             'mozharness_python': '/tools/buildbot/bin/python',
             'reboot_command': ['scripts/external_tools/count_and_reboot.py',
                                '-f', '../reboot_count.txt', '-n', '1', '-z'],
             'mozharness_desktop_build': {
                 'script_name': 'scripts/fx_desktop_build.py',
                 'extra_args': [
                     '--config', 'builds/releng_base_mac_64_builds.py',
                     '--custom-build-variant-cfg', 'stat-and-debug',
+                    '--config', GLOBAL_VARS['mozharness_configs']['balrog'],
                 ],
                 'script_timeout': 3 * 3600,
                 'script_maxtime': int(5.5 * 3600),
             },
 
             'enable_nightly': False,
             'enable_xulrunner': False,
             'product_name': 'firefox',
@@ -1321,16 +1334,17 @@ PLATFORM_VARS = {
                 'scripts/external_tools/count_and_reboot.py',
                 '-f', '../reboot_count.txt','-n', '1', '-z'
             ],
             'mozharness_desktop_build': {
                 'script_name': 'scripts/fx_desktop_build.py',
                 'extra_args': [
                     '--config', 'builds/releng_base_windows_32_builds.py',
                     '--custom-build-variant-cfg', 'debug',
+                    '--config', GLOBAL_VARS['mozharness_configs']['balrog'],
                 ],
                 'script_timeout': 3 * 3600,
                 'script_maxtime': int(5.5 * 3600),
             },
 
             'enable_nightly': False,
             'enable_xulrunner': False,
             'product_name': 'firefox',
@@ -1367,16 +1381,17 @@ PLATFORM_VARS = {
         },
         'win64-debug': {
             'mozharness_python': ['c:/mozilla-build/python27/python', '-u'],
             'mozharness_desktop_build': {
                 'script_name': 'scripts/fx_desktop_build.py',
                 'extra_args': [
                     '--config', 'builds/releng_base_windows_64_builds.py',
                     '--custom-build-variant-cfg', 'debug',
+                    '--config', GLOBAL_VARS['mozharness_configs']['balrog'],
                 ],
                 'script_timeout': 3 * 3600,
                 'script_maxtime': int(5.5 * 3600),
             },
             'reboot_command': [
                 'c:/mozilla-build/python27/python', '-u',
                 'scripts/external_tools/count_and_reboot.py',
                 '-f', '../reboot_count.txt','-n', '1', '-z'