--- a/mozilla/b2g_config.py
+++ b/mozilla/b2g_config.py
@@ -1852,16 +1852,18 @@ BRANCHES['mozilla-central']['platforms']
 # This is a path, relative to HGURL, where the repository is located
 # HGURL + repo_path should be a valid repository
 BRANCHES['mozilla-b2g37_v2_2']['repo_path'] = 'releases/mozilla-b2g37_v2_2'
 BRANCHES['mozilla-b2g37_v2_2']['gaia_l10n_root'] = 'https://hg.mozilla.org/gaia-l10n'
 BRANCHES['mozilla-b2g37_v2_2']['gecko_l10n_root'] = 'https://hg.mozilla.org/releases/l10n/mozilla-aurora'
 BRANCHES['mozilla-b2g37_v2_2']['start_hour'] = [0, 16]
 BRANCHES['mozilla-b2g37_v2_2']['start_minute'] = [25]
 BRANCHES['mozilla-b2g37_v2_2']['periodic_start_minute'] = 30
+BRANCHES['mozilla-b2g37_v2_2']['platforms']['macosx64']['slave_platforms'] = 'snowleopard'
+BRANCHES['mozilla-b2g37_v2_2']['platforms']['macosx64-debug']['slave_platforms'] = 'snowleopard'
 BRANCHES['mozilla-b2g37_v2_2']['platforms']['linux64-b2g-haz']['enable_nightly'] = False
 BRANCHES['mozilla-b2g37_v2_2']['platforms']['nexus-4']['enable_nightly'] = True
 BRANCHES['mozilla-b2g37_v2_2']['platforms']['nexus-4_eng']['enable_nightly'] = True
 BRANCHES['mozilla-b2g37_v2_2']['platforms']['nexus-4_eng']['consider_for_nightly'] = False
 BRANCHES['mozilla-b2g37_v2_2']['platforms']['nexus-5-l']['enable_nightly'] = True
 BRANCHES['mozilla-b2g37_v2_2']['platforms']['nexus-5-l_eng']['enable_nightly'] = True
 BRANCHES['mozilla-b2g37_v2_2']['platforms']['nexus-5-l_eng']['consider_for_nightly'] = False
 BRANCHES['mozilla-b2g37_v2_2']['platforms']['flame-kk']['enable_nightly'] = True
@@ -1881,16 +1883,18 @@ BRANCHES['mozilla-b2g37_v2_2']['platform
 # This is a path, relative to HGURL, where the repository is located
 # HGURL + repo_path should be a valid repository
 BRANCHES['mozilla-b2g34_v2_1']['repo_path'] = 'releases/mozilla-b2g34_v2_1'
 BRANCHES['mozilla-b2g34_v2_1']['gaia_l10n_root'] = 'https://hg.mozilla.org/releases/gaia-l10n/v2_1/'
 BRANCHES['mozilla-b2g34_v2_1']['gecko_l10n_root'] = 'https://hg.mozilla.org/releases/l10n/mozilla-beta'
 BRANCHES['mozilla-b2g34_v2_1']['start_hour'] = [0, 16]
 BRANCHES['mozilla-b2g34_v2_1']['start_minute'] = [12]
 BRANCHES['mozilla-b2g34_v2_1']['periodic_start_minute'] = 30
+BRANCHES['mozilla-b2g34_v2_1']['platforms']['macosx64']['slave_platforms'] = 'snowleopard'
+BRANCHES['mozilla-b2g34_v2_1']['platforms']['macosx64-debug']['slave_platforms'] = 'snowleopard'
 BRANCHES['mozilla-b2g34_v2_1']['platforms']['nexus-4']['enable_nightly'] = True
 BRANCHES['mozilla-b2g34_v2_1']['platforms']['nexus-4_eng']['enable_nightly'] = True
 BRANCHES['mozilla-b2g34_v2_1']['platforms']['nexus-4_eng']['consider_for_nightly'] = False
 BRANCHES['mozilla-b2g34_v2_1']['platforms']['nexus-5-l']['enable_periodic'] = False
 BRANCHES['mozilla-b2g34_v2_1']['platforms']['nexus-5-l_eng']['enable_periodic'] = False
 BRANCHES['mozilla-b2g34_v2_1']['platforms']['flame']['enable_nightly'] = True
 BRANCHES['mozilla-b2g34_v2_1']['platforms']['flame_eng']['enable_nightly'] = True
 BRANCHES['mozilla-b2g34_v2_1']['platforms']['flame-kk']['enable_nightly'] = True
@@ -1908,16 +1912,18 @@ BRANCHES['mozilla-b2g34_v2_1']['platform
 # This is a path, relative to HGURL, where the repository is located
 # HGURL + repo_path should be a valid repository
 BRANCHES['mozilla-b2g34_v2_1s']['repo_path'] = 'releases/mozilla-b2g34_v2_1s'
 BRANCHES['mozilla-b2g34_v2_1s']['gaia_l10n_root'] = 'https://hg.mozilla.org/releases/gaia-l10n/v2_1/'
 BRANCHES['mozilla-b2g34_v2_1s']['gecko_l10n_root'] = 'https://hg.mozilla.org/releases/l10n/mozilla-beta'
 BRANCHES['mozilla-b2g34_v2_1s']['start_hour'] = [0, 16]
 BRANCHES['mozilla-b2g34_v2_1s']['start_minute'] = [12]
 BRANCHES['mozilla-b2g34_v2_1s']['periodic_start_minute'] = 30
+BRANCHES['mozilla-b2g34_v2_1s']['platforms']['macosx64']['slave_platforms'] = 'snowleopard'
+BRANCHES['mozilla-b2g34_v2_1s']['platforms']['macosx64-debug']['slave_platforms'] = 'snowleopard'
 BRANCHES['mozilla-b2g34_v2_1s']['platforms']['emulator-jb']['enable_nightly'] = True
 BRANCHES['mozilla-b2g34_v2_1s']['platforms']['emulator-jb-debug']['enable_nightly'] = True
 BRANCHES['mozilla-b2g34_v2_1s']['platforms']['emulator-kk']['enable_nightly'] = True
 BRANCHES['mozilla-b2g34_v2_1s']['platforms']['emulator-kk-debug']['enable_nightly'] = True
 BRANCHES['mozilla-b2g34_v2_1s']['platforms']['dolphin']['enable_nightly'] = True
 BRANCHES['mozilla-b2g34_v2_1s']['platforms']['dolphin_eng']['enable_nightly'] = True
 BRANCHES['mozilla-b2g34_v2_1s']['platforms']['dolphin-512']['enable_nightly'] = True
 BRANCHES['mozilla-b2g34_v2_1s']['platforms']['dolphin-512_eng']['enable_nightly'] = True
@@ -1935,16 +1941,18 @@ BRANCHES['mozilla-b2g34_v2_1s']['platfor
 # This is a path, relative to HGURL, where the repository is located
 # HGURL + repo_path should be a valid repository
 BRANCHES['mozilla-b2g32_v2_0']['repo_path'] = 'releases/mozilla-b2g32_v2_0'
 BRANCHES['mozilla-b2g32_v2_0']['gaia_l10n_root'] = 'https://hg.mozilla.org/releases/gaia-l10n/v2_0/'
 BRANCHES['mozilla-b2g32_v2_0']['gecko_l10n_root'] = 'https://hg.mozilla.org/releases/l10n/mozilla-beta'
 BRANCHES['mozilla-b2g32_v2_0']['start_hour'] = [0, 16]
 BRANCHES['mozilla-b2g32_v2_0']['start_minute'] = [2]
 BRANCHES['mozilla-b2g32_v2_0']['periodic_start_minute'] = 30
+BRANCHES['mozilla-b2g32_v2_0']['platforms']['macosx64']['slave_platforms'] = 'snowleopard'
+BRANCHES['mozilla-b2g32_v2_0']['platforms']['macosx64-debug']['slave_platforms'] = 'snowleopard'
 BRANCHES['mozilla-b2g32_v2_0']['platforms']['nexus-4']['enable_nightly'] = True
 BRANCHES['mozilla-b2g32_v2_0']['platforms']['flame-kk']['enable_nightly'] = True
 BRANCHES['mozilla-b2g32_v2_0']['platforms']['flame-kk_eng']['enable_nightly'] = True
 BRANCHES['mozilla-b2g32_v2_0']['platforms']['emulator']['enable_nightly'] = True
 BRANCHES['mozilla-b2g32_v2_0']['platforms']['emulator-debug']['enable_nightly'] = True
 BRANCHES['mozilla-b2g32_v2_0']['platforms']['emulator-jb']['enable_nightly'] = True
 BRANCHES['mozilla-b2g32_v2_0']['platforms']['emulator-jb-debug']['enable_nightly'] = True
 BRANCHES['mozilla-b2g32_v2_0']['platforms']['emulator-kk']['enable_nightly'] = True
@@ -1956,16 +1964,18 @@ BRANCHES['mozilla-b2g32_v2_0']['platform
 # This is a path, relative to HGURL, where the repository is located
 # HGURL + repo_path should be a valid repository
 BRANCHES['mozilla-b2g30_v1_4']['repo_path'] = 'releases/mozilla-b2g30_v1_4'
 BRANCHES['mozilla-b2g30_v1_4']['gaia_l10n_root'] = 'https://hg.mozilla.org/releases/gaia-l10n/v1_4/'
 BRANCHES['mozilla-b2g30_v1_4']['gecko_l10n_root'] = 'https://hg.mozilla.org/releases/l10n/mozilla-beta'
 BRANCHES['mozilla-b2g30_v1_4']['start_hour'] = [0, 16]
 BRANCHES['mozilla-b2g30_v1_4']['start_minute'] = [2]
 BRANCHES['mozilla-b2g30_v1_4']['periodic_start_minute'] = 30
+BRANCHES['mozilla-b2g30_v1_4']['platforms']['macosx64']['slave_platforms'] = 'snowleopard'
+BRANCHES['mozilla-b2g30_v1_4']['platforms']['macosx64-debug']['slave_platforms'] = 'snowleopard'
 BRANCHES['mozilla-b2g30_v1_4']['platforms']['nexus-4']['enable_nightly'] = True
 BRANCHES['mozilla-b2g30_v1_4']['platforms']['flame']['enable_nightly'] = True
 BRANCHES['mozilla-b2g30_v1_4']['platforms']['flame_eng']['enable_nightly'] = True
 BRANCHES['mozilla-b2g30_v1_4']['platforms']['emulator']['enable_nightly'] = True
 BRANCHES['mozilla-b2g30_v1_4']['platforms']['emulator-debug']['enable_nightly'] = True
 BRANCHES['mozilla-b2g30_v1_4']['platforms']['emulator-jb']['enable_nightly'] = True
 BRANCHES['mozilla-b2g30_v1_4']['platforms']['emulator-jb-debug']['enable_nightly'] = True
 BRANCHES['mozilla-b2g30_v1_4']['platforms']['emulator-kk']['enable_nightly'] = True