--- a/mozilla-tests/config.py
+++ b/mozilla-tests/config.py
@@ -3605,16 +3605,27 @@ for name, branch in items_at_least(BRANC
             for i in ['opt_unittest_suites', 'debug_unittest_suites']:
                 if  MOCHITEST_WEBGL[0] in branch['platforms'][platform][slave_platform][i]:
                     branch['platforms'][platform][slave_platform][i] = [item for item in branch['platforms'][platform][slave_platform][i] if item not in MOCHITEST_WEBGL]
                     branch['platforms'][platform][slave_platform][i] += MOCHITEST_WEBGL_CHUNKED
                 if MOCHITEST_WEBGL_E10S[0] in branch['platforms'][platform][slave_platform][i]:
                     branch['platforms'][platform][slave_platform][i] = [item for item in branch['platforms'][platform][slave_platform][i] if item not in MOCHITEST_WEBGL_E10S]
                     branch['platforms'][platform][slave_platform][i] += MOCHITEST_WEBGL_CHUNKED_E10S
 
+# Bug 1308544 - Enable automation jobs on Cedar twig
+for branch in BRANCHES.keys():
+    if branch not in ['cedar']:
+        continue
+    for test in ['opt_unittest_suites', 'debug_unittest_suites']:
+        for platform in BRANCHES[branch]['platforms'].keys():
+                BRANCHES[branch]['platforms']['win64']['win8_64'][test] = [item for item in BRANCHES[branch]['platforms']['win64']['win8_64'][test] if (item[0].startswith('mochitest') or item in XPCSHELL)]
+                BRANCHES[branch]['platforms']['macosx64']['yosemite_r7'][test] = [item for item in BRANCHES[branch]['platforms']['macosx64']['yosemite_r7'][test] if (item[0].startswith('mochitest') or item in XPCSHELL)]
+                if test in ['opt_unittest_suites']:
+                    BRANCHES[branch]['platforms']['linux64']['ubuntu64_vm'][test] = [item for item in BRANCHES[branch]['platforms']['linux64']['ubuntu64_vm'][test] if (item[0].startswith('mochitest') or item in XPCSHELL)]
+
 
 if __name__ == "__main__":
     import sys
     import pprint
 
     args = sys.argv[1:]
 
     if len(args) > 0:

--- a/mozilla/project_branches.py
+++ b/mozilla/project_branches.py
@@ -68,17 +68,37 @@ PROJECT_BRANCHES = {
         'pgo_strategy': 'periodic',
         'periodic_start_hours': range(0, 24, 3),
         'talos_suites': {
             'xperf': 1,
         },
         'branch_projects': ['spidermonkey_tier_1'],
     },
     #'birch': {},  # Bug 1010674
-    #'cedar': {},  # Bug 1272005
+# Bug 1308544 - Enable automation jobs on Cedar twig
+    'cedar': {
+        'enable_perproduct_builds': False,
+        'lock_platforms': True,
+        'mozharness_tag': 'default',
+        'enable_talos': True,
+        'talos_suites': {
+            'other': 1,
+            'svgr': 1,
+            'tp5o': 1,
+            'other-e10s': 1,
+            'svgr-e10s': 1,
+            'tp5o-e10s': 1,
+        },
+        'enable_opt_unittests': True,
+        'platforms': {
+            'linux64': {},
+            'macosx64': {},
+            'win64': {},
+        },
+    },
     'cypress': {
         'lock_platforms': True,
         'platforms': {
             # Limit Firefox to none for Bug 787208
         },
     },
     'date': {
         'enable_talos': False,