--- a/mozilla-tests/config.py
+++ b/mozilla-tests/config.py
@@ -1884,28 +1884,28 @@ BRANCHES['cedar']['platforms']['win64'][
 # due to the currently global coalescing limit of 3 defined at
 # http://hg.mozilla.org/build/buildbotcustom/file/e3713abcd36d/misc.py#l647
 BRANCHES['mozilla-inbound']['platforms']['win32']['xp-ix']['opt_unittest_skipcount'] = 2
 BRANCHES['mozilla-inbound']['platforms']['win32']['xp-ix']['opt_unittest_skiptimeout'] = 1800
 BRANCHES['mozilla-inbound']['platforms']['win32']['win7-ix']['opt_unittest_skipcount'] = 2
 BRANCHES['mozilla-inbound']['platforms']['win32']['win7-ix']['opt_unittest_skiptimeout'] = 1800
 BRANCHES['mozilla-inbound']['platforms']['win64']['win8_64']['opt_unittest_skipcount'] = 3
 BRANCHES['mozilla-inbound']['platforms']['win64']['win8_64']['opt_unittest_skiptimeout'] = 1800
-BRANCHES['mozilla-inbound']['platforms']['macosx64']['mountainlion']['opt_unittest_skipcount'] = 3
-BRANCHES['mozilla-inbound']['platforms']['macosx64']['mountainlion']['opt_unittest_skiptimeout'] = 1800
+BRANCHES['mozilla-inbound']['platforms']['macosx64']['mountainlion']['opt_unittest_skipcount'] = 6
+BRANCHES['mozilla-inbound']['platforms']['macosx64']['mountainlion']['opt_unittest_skiptimeout'] = 3200
 BRANCHES['mozilla-inbound']['platforms']['win32']['xp-ix']['debug_unittest_skipcount'] = 2
 BRANCHES['mozilla-inbound']['platforms']['win32']['xp-ix']['debug_unittest_skiptimeout'] = 1800
 BRANCHES['mozilla-inbound']['platforms']['win32']['win7-ix']['debug_unittest_skipcount'] = 2
 BRANCHES['mozilla-inbound']['platforms']['win32']['win7-ix']['debug_unittest_skiptimeout'] = 1800
 BRANCHES['mozilla-inbound']['platforms']['win64']['win8_64']['debug_unittest_skipcount'] = 3
 BRANCHES['mozilla-inbound']['platforms']['win64']['win8_64']['debug_unittest_skiptimeout'] = 1800
 BRANCHES['mozilla-inbound']['platforms']['macosx64']['snowleopard']['debug_unittest_skipcount'] = 2
 BRANCHES['mozilla-inbound']['platforms']['macosx64']['snowleopard']['debug_unittest_skiptimeout'] = 1800
-BRANCHES['mozilla-inbound']['platforms']['macosx64']['mountainlion']['debug_unittest_skipcount'] = 3
-BRANCHES['mozilla-inbound']['platforms']['macosx64']['mountainlion']['debug_unittest_skiptimeout'] = 1800
+BRANCHES['mozilla-inbound']['platforms']['macosx64']['mountainlion']['debug_unittest_skipcount'] = 6
+BRANCHES['mozilla-inbound']['platforms']['macosx64']['mountainlion']['debug_unittest_skiptimeout'] = 3200
 BRANCHES['mozilla-inbound']['platforms']['macosx64']['yosemite']['debug_unittest_skipcount'] = 2
 BRANCHES['mozilla-inbound']['platforms']['macosx64']['yosemite']['debug_unittest_skiptimeout'] = 1800
 BRANCHES['mozilla-inbound']['platforms']['linux']['ubuntu32_vm']['debug_unittest_skipcount'] = 2
 BRANCHES['mozilla-inbound']['platforms']['linux']['ubuntu32_vm']['debug_unittest_skiptimeout'] = 1800
 
 # Enable mozharness pinning
 for _, branch in items_at_least(BRANCHES, 'gecko_version', 30):
     branch['script_repo_manifest'] = \