diff --git a/testing/awsy/awsy/test_base_memory_usage.py b/testing/awsy/awsy/test_base_memory_usage.py
index c7b3902a73d9..02f6d06c3bb3 100644
--- a/testing/awsy/awsy/test_base_memory_usage.py
+++ b/testing/awsy/awsy/test_base_memory_usage.py
@@ -81,8 +81,6 @@ class TestMemoryUsage(AwsyTestCase):
             self.open_pages()
             self.settle()
             self.settle()
-            self.settle()
-            self.settle()
             self.assertTrue(self.do_full_gc())
             self.settle()
             create_checkpoint("TabsOpenForceGC", itr)
diff --git a/testing/awsy/conf/base-testvars.json b/testing/awsy/conf/base-testvars.json
new file mode 100644
index 000000000000..801fc5243035
--- /dev/null
+++ b/testing/awsy/conf/base-testvars.json
@@ -0,0 +1,6 @@
+{
+  "entities": 4,
+  "iterations": 1,
+  "perTabPause": 10,
+  "settleWaitTime": 60
+}
diff --git a/testing/mozharness/scripts/awsy_script.py b/testing/mozharness/scripts/awsy_script.py
index a74d65023e6d..7d0a56906b16 100644
--- a/testing/mozharness/scripts/awsy_script.py
+++ b/testing/mozharness/scripts/awsy_script.py
@@ -157,7 +157,12 @@ class AWSY(TestingMixin, MercurialScript, BlobUploadMixin, TooltoolMixin, CodeCo
         runtime_testvars_file.close()
 
         cmd = ['marionette']
-        cmd.append("--testvars=%s" % os.path.join(self.awsy_path, "conf", "testvars.json"))
+
+        if self.config['test_about_blank']:
+            cmd.append("--testvars=%s" % os.path.join(self.awsy_path, "conf", "base-testvars.json"))
+        else:
+            cmd.append("--testvars=%s" % os.path.join(self.awsy_path, "conf", "testvars.json"))
+
         cmd.append("--testvars=%s" % runtime_testvars_path)
         cmd.append("--log-raw=-")
         cmd.append("--log-errorsummary=%s" % error_summary_file)