--- a/mozilla-tests/config.py
+++ b/mozilla-tests/config.py
@@ -673,16 +673,26 @@ CRASHTEST_E10S = [
         'use_mozharness': True,
         'script_path': 'scripts/desktop_unittest.py',
         'extra_args': ['--reftest-suite', 'crashtest', '--e10s'],
         'blob_upload': True,
         'script_maxtime': 7200,
     }),
 ]
 
+JSREFTEST_E10S = [
+    ('jsreftest-e10s', {
+        'use_mozharness': True,
+        'script_path': 'scripts/desktop_unittest.py',
+        'extra_args': ['--reftest-suite', 'jsreftest', '--e10s'],
+        'blob_upload': True,
+        'script_maxtime': 7200,
+    }),
+]
+
 OTHER_REFTESTS = [
     ('jsreftest', {
         'use_mozharness': True,
         'script_path': 'scripts/desktop_unittest.py',
         'extra_args': ['--reftest-suite', 'jsreftest'],
         'blob_upload': True,
         'script_maxtime': 7200,
     }),
@@ -932,16 +942,19 @@ PLATFORM_UNITTEST_VARS = {
                     'config_files': ["unittests/linux_unittest.py"],
                 },
                 'reftest-e10s': {
                     'config_files': ["unittests/linux_unittest.py"],
                 },
                 'jsreftest': {
                     'config_files': ["unittests/linux_unittest.py"],
                 },
+                'jsreftest-e10s': {
+                    'config_files': ["unittests/linux_unittest.py"],
+                },
                 'crashtest': {
                     'config_files': ["unittests/linux_unittest.py"],
                 },
                 'crashtest-e10s': {
                     'config_files': ["unittests/linux_unittest.py"],
                 },
                 'reftest-no-accel': {
                     'config_files': ["unittests/linux_unittest.py"],
@@ -1049,16 +1062,19 @@ PLATFORM_UNITTEST_VARS = {
                     'config_files': ["unittests/linux_unittest.py"],
                 },
                 'reftest-e10s': {
                     'config_files': ["unittests/linux_unittest.py"],
                 },
                 'jsreftest': {
                     'config_files': ["unittests/linux_unittest.py"],
                 },
+                'jsreftest-e10s': {
+                    'config_files': ["unittests/linux_unittest.py"],
+                },
                 'crashtest': {
                     'config_files': ["unittests/linux_unittest.py"],
                 },
                 'crashtest-e10s': {
                     'config_files': ["unittests/linux_unittest.py"],
                 },
                 'reftest-no-accel': {
                     'config_files': ["unittests/linux_unittest.py"],
@@ -1168,16 +1184,19 @@ PLATFORM_UNITTEST_VARS = {
                     'config_files': ["unittests/linux_unittest.py"],
                 },
                 'reftest-e10s': {
                     'config_files': ["unittests/linux_unittest.py"],
                 },
                 'jsreftest': {
                     'config_files': ["unittests/linux_unittest.py"],
                 },
+                'jsreftest-e10s': {
+                    'config_files': ["unittests/linux_unittest.py"],
+                },
                 'crashtest': {
                     'config_files': ["unittests/linux_unittest.py"],
                 },
                 'crashtest-e10s': {
                     'config_files': ["unittests/linux_unittest.py"],
                 },
                 'reftest-no-accel': {
                     'config_files': ["unittests/linux_unittest.py"],
@@ -1283,16 +1302,19 @@ PLATFORM_UNITTEST_VARS = {
                     'config_files': ["unittests/linux_unittest.py"],
                 },
                 'reftest-e10s': {
                     'config_files': ["unittests/linux_unittest.py"],
                 },
                 'jsreftest': {
                     'config_files': ["unittests/linux_unittest.py"],
                 },
+                'jsreftest-e10s': {
+                    'config_files': ["unittests/linux_unittest.py"],
+                },
                 'crashtest': {
                     'config_files': ["unittests/linux_unittest.py"],
                 },
                 'crashtest-e10s': {
                     'config_files': ["unittests/linux_unittest.py"],
                 },
                 'reftest-no-accel': {
                     'config_files': ["unittests/linux_unittest.py"],
@@ -1398,16 +1420,19 @@ PLATFORM_UNITTEST_VARS = {
                     'config_files': ["unittests/linux_unittest.py"],
                 },
                 'reftest-e10s': {
                     'config_files': ["unittests/linux_unittest.py"],
                 },
                 'jsreftest': {
                     'config_files': ["unittests/linux_unittest.py"],
                 },
+                'jsreftest-e10s': {
+                    'config_files': ["unittests/linux_unittest.py"],
+                },
                 'crashtest': {
                     'config_files': ["unittests/linux_unittest.py"],
                 },
                 'crashtest-e10s': {
                     'config_files': ["unittests/linux_unittest.py"],
                 },
                 'reftest-no-accel': {
                     'config_files': ["unittests/linux_unittest.py"],
@@ -1520,16 +1545,19 @@ PLATFORM_UNITTEST_VARS = {
                     'config_files': ["unittests/win_unittest.py"],
                 },
                 'reftest-e10s': {
                     'config_files': ["unittests/win_unittest.py"],
                 },
                 'jsreftest': {
                     'config_files': ["unittests/win_unittest.py"],
                 },
+                'jsreftest-e10s': {
+                    'config_files': ["unittests/win_unittest.py"],
+                },
                 'crashtest': {
                     'config_files': ["unittests/win_unittest.py"],
                 },
                 'crashtest-e10s': {
                     'config_files': ["unittests/win_unittest.py"],
                 },
                 'reftest-no-accel': {
                     'config_files': ["unittests/win_unittest.py"],
@@ -1634,16 +1662,19 @@ PLATFORM_UNITTEST_VARS = {
                     'config_files': ["unittests/win_unittest.py"],
                 },
                 'reftest-e10s': {
                     'config_files': ["unittests/win_unittest.py"],
                 },
                 'jsreftest': {
                     'config_files': ["unittests/win_unittest.py"],
                 },
+                'jsreftest-e10s': {
+                    'config_files': ["unittests/win_unittest.py"],
+                },
                 'crashtest': {
                     'config_files': ["unittests/win_unittest.py"],
                 },
                 'crashtest-e10s': {
                     'config_files': ["unittests/win_unittest.py"],
                 },
                 'reftest-no-accel': {
                     'config_files': ["unittests/win_unittest.py"],
@@ -1748,16 +1779,19 @@ PLATFORM_UNITTEST_VARS = {
                     'config_files': ["unittests/win_unittest.py"],
                 },
                 'reftest-e10s': {
                     'config_files': ["unittests/win_unittest.py"],
                 },
                 'jsreftest': {
                     'config_files': ["unittests/win_unittest.py"],
                 },
+                'jsreftest-e10s': {
+                    'config_files': ["unittests/win_unittest.py"],
+                },
                 'crashtest': {
                     'config_files': ["unittests/win_unittest.py"],
                 },
                 'crashtest-e10s': {
                     'config_files': ["unittests/win_unittest.py"],
                 },
                 'reftest-no-accel': {
                     'config_files': ["unittests/win_unittest.py"],
@@ -1870,16 +1904,19 @@ PLATFORM_UNITTEST_VARS = {
                     'config_files': ["unittests/win_unittest.py"],
                 },
                 'reftest-e10s': {
                     'config_files': ["unittests/win_unittest.py"],
                 },
                 'jsreftest': {
                     'config_files': ["unittests/win_unittest.py"],
                 },
+                'jsreftest-e10s': {
+                    'config_files': ["unittests/win_unittest.py"],
+                },
                 'crashtest': {
                     'config_files': ["unittests/win_unittest.py"],
                 },
                 'crashtest-e10s': {
                     'config_files': ["unittests/win_unittest.py"],
                 },
                 'reftest-no-accel': {
                     'config_files': ["unittests/win_unittest.py"],
@@ -1972,16 +2009,19 @@ PLATFORM_UNITTEST_VARS = {
                     'config_files': ["unittests/win_unittest.py"],
                 },
                 'reftest-e10s': {
                     'config_files': ["unittests/win_unittest.py"],
                 },
                 'jsreftest': {
                     'config_files': ["unittests/win_unittest.py"],
                 },
+                'jsreftest-e10s': {
+                    'config_files': ["unittests/win_unittest.py"],
+                },
                 'crashtest': {
                     'config_files': ["unittests/win_unittest.py"],
                 },
                 'crashtest-e10s': {
                     'config_files': ["unittests/win_unittest.py"],
                 },
                 'reftest-no-accel': {
                     'config_files': ["unittests/win_unittest.py"],
@@ -2083,16 +2123,19 @@ PLATFORM_UNITTEST_VARS = {
                     'config_files': ["unittests/mac_unittest.py"],
                 },
                 'reftest-e10s': {
                     'config_files': ["unittests/mac_unittest.py"],
                 },
                 'jsreftest': {
                     'config_files': ["unittests/mac_unittest.py"],
                 },
+                'jsreftest-e10s': {
+                    'config_files': ["unittests/mac_unittest.py"],
+                },
                 'crashtest': {
                     'config_files': ["unittests/mac_unittest.py"],
                 },
                 'crashtest-e10s': {
                     'config_files': ["unittests/mac_unittest.py"],
                 },
                 'reftest-no-accel': {
                     'config_files': ["unittests/mac_unittest.py"],
@@ -2186,16 +2229,19 @@ PLATFORM_UNITTEST_VARS = {
                     'config_files': ["unittests/mac_unittest.py"],
                 },
                 'reftest-e10s': {
                     'config_files': ["unittests/mac_unittest.py"],
                 },
                 'jsreftest': {
                     'config_files': ["unittests/mac_unittest.py"],
                 },
+                'jsreftest-e10s': {
+                    'config_files': ["unittests/mac_unittest.py"],
+                },
                 'crashtest': {
                     'config_files': ["unittests/mac_unittest.py"],
                 },
                 'crashtest-e10s': {
                     'config_files': ["unittests/mac_unittest.py"],
                 },
                 'reftest-no-accel': {
                     'config_files': ["unittests/mac_unittest.py"],
@@ -2289,16 +2335,19 @@ PLATFORM_UNITTEST_VARS = {
                     'config_files': ["unittests/mac_unittest.py"],
                 },
                 'reftest-e10s': {
                     'config_files': ["unittests/mac_unittest.py"],
                 },
                 'jsreftest': {
                     'config_files': ["unittests/mac_unittest.py"],
                 },
+                'jsreftest-e10s': {
+                    'config_files': ["unittests/mac_unittest.py"],
+                },
                 'crashtest': {
                     'config_files': ["unittests/mac_unittest.py"],
                 },
                 'crashtest-e10s': {
                     'config_files': ["unittests/mac_unittest.py"],
                 },
                 'reftest-no-accel': {
                     'config_files': ["unittests/mac_unittest.py"],
@@ -2721,27 +2770,28 @@ for name, branch in items_at_least(BRANC
                 branch['platforms'][platform][slave_platform]['opt_unittest_suites'] += WEB_PLATFORM_TESTS_CHUNKED_E10S + WEB_PLATFORM_REFTESTS_E10S
 
 # Bug 1215233 - Enable more e10s tests on Windows 7 only
 #   Turn on mochitest-gl-e10s - bug 1221102
 #   Turn on mochitest-e10s-devtools-chrome - bug 1221499
 #   Turn on mochitest-e10s - bug 1232780
 #   Turn on reftest-e10s - bug 1239025
 #   Turn on crashtest-e10s - bug 1240825
+#   Turn on jsreftest-e10s - bug 1246627
 for name, branch in items_at_least(BRANCHES, 'gecko_version', trunk_gecko_version):
     for platform in PLATFORMS.keys():
         if platform not in branch['platforms']:
             continue
         for slave_platform in PLATFORMS[platform]['slave_platforms']:
             if slave_platform in branch['platforms'][platform] and slave_platform in ('win7-ix', 'win7-all'):
                 if name not in TWIGS:
                     branch['platforms'][platform][slave_platform]['debug_unittest_suites'] += \
-                        MOCHITEST_WEBGL_E10S + MOCHITEST_DT_8_E10S + REFTEST_E10S + CRASHTEST_E10S
+                        MOCHITEST_WEBGL_E10S + MOCHITEST_DT_8_E10S + REFTEST_E10S + CRASHTEST_E10S + JSREFTEST_E10S
                     branch['platforms'][platform][slave_platform]['opt_unittest_suites'] += \
-                        MOCHITEST_WEBGL_E10S + MOCHITEST_DT_8_E10S + MOCHITEST_E10S + REFTEST_E10S + CRASHTEST_E10S
+                        MOCHITEST_WEBGL_E10S + MOCHITEST_DT_8_E10S + MOCHITEST_E10S + REFTEST_E10S + CRASHTEST_E10S + JSREFTEST_E10S
 
 # Bug 1200437
 # Use 7 chunks for m-bc on branches > trunk, excluding twigs, 3 chunks elsewhere
 # Bug 1203227
 # Use 9 chunks for m-dt on branches > trunk, excluding twigs, 2 or 4 chunks elsewhere
 for branch in BRANCHES.keys():
     for platform in PLATFORMS.keys():
         if platform not in BRANCHES[branch]['platforms']: