--- a/testing/mozharness/configs/builds/branch_specifics.py
+++ b/testing/mozharness/configs/builds/branch_specifics.py
@@ -89,24 +89,40 @@ config = {
                 'update_channel': 'default',
             },
             'win64-debug': {
                 'update_channel': 'default',
             },
         },
     },
     'mozilla-beta': {
+        'enable_release_promotion': 1,
         'repo_path': 'releases/mozilla-beta',
         # TODO I think we can remove update_channel since we don't run
         # nightlies for mozilla-beta
         'update_channel': 'beta',
         'branch_uses_per_checkin_strategy': True,
         'use_branch_in_symbols_extra_buildid': False,
         'stage_server': 'upload.ffxbld.productdelivery.prod.mozaws.net',
         'platform_overrides': {
+            'linux': {
+                'src_mozconfig': 'browser/config/mozconfigs/linux32/beta',
+            },
+            'linux64': {
+                'src_mozconfig': 'browser/config/mozconfigs/linux64/beta',
+            },
+            'macosx64': {
+                'src_mozconfig': 'browser/config/mozconfigs/macosx-universal/beta',
+            },
+            'win32': {
+                'src_mozconfig': 'browser/config/mozconfigs/win32/beta',
+            },
+            'win64': {
+                'src_mozconfig': 'browser/config/mozconfigs/win64/beta',
+            },
             'linux-debug': {
                 'update_channel': 'default',
             },
             'linux64-debug': {
                 'update_channel': 'default',
             },
             'linux64-asan-debug': {
                 'update_channel': 'default',

new file mode 100644
--- /dev/null
+++ b/testing/mozharness/configs/single_locale/mozilla-beta.py
@@ -0,0 +1,44 @@
+config = {
+    "nightly_build": True,
+    "branch": "mozilla-beta",
+    "en_us_binary_url": "http://ftp.mozilla.org/pub/mozilla.org/firefox/nightly/latest-mozilla-beta/",
+    "update_channel": "beta",
+    "latest_mar_dir": '/pub/mozilla.org/firefox/nightly/latest-mozilla-beta-l10n',
+
+    # l10n
+    "hg_l10n_base": "https://hg.mozilla.org/releases/l10n/mozilla-beta",
+
+    # mar
+    # No nightly on beta, using aurora mar tools
+    "mar_tools_url": "http://ftp.mozilla.org/pub/mozilla.org/firefox/nightly/latest-mozilla-aurora/mar-tools/%(platform)s",
+
+    # repositories
+    "mozilla_dir": "mozilla-beta",
+    "repos": [{
+        "vcs": "hg",
+        "repo": "https://hg.mozilla.org/build/tools",
+        "revision": "default",
+        "dest": "tools",
+    }, {
+        "vcs": "hgtool",
+        "repo": "https://hg.mozilla.org/releases/mozilla-beta",
+        "revision": "default",
+        "dest": "mozilla-beta",
+    }, {
+        "vcs": "hgtool",
+        "repo": "https://hg.mozilla.org/build/compare-locales",
+        "revision": "RELEASE_AUTOMATION"
+    }],
+    # purge options
+    'purge_minsize': 12,
+    'is_automation': True,
+    'default_actions': [
+        "clobber",
+        "pull",
+        "list-locales",
+        "setup",
+        "repack",
+        "taskcluster-upload",
+        "summary",
+    ],
+}