--- a/mozilla/project_branches.py
+++ b/mozilla/project_branches.py
@@ -174,16 +174,17 @@ PROJECT_BRANCHES = {
         'update_verify_chunks': 6,
         'beetmover_credentials': '/builds/dev-beetmover-s3.credentials',
         'beetmover_candidates_bucket': 'mozilla-releng-beet-mover-dev',
         'stage_product': {
             'firefox': 'firefox',
             'fennec': 'mobile',
         },
         'push_to_releases_automatic': True,
+        'merge_builds': False,
     },
     'elm': {
         'branch_projects': [],
         'enable_talos': True,
         'enable_valgrind': False,
         'lock_platforms': True,
         'platforms': {
             # dep signing with nightly key, see bug 1176152