Bug 1829464 - Fix intermittent in test_main_tab_scalars.py r=chutten

Differential Revision: https://phabricator.services.mozilla.com/D176377

UltraBlame original commit: 0b8c708afdfb6f47428bbbb17c50b19d341e669d

Author: marco-c

toolkit/components/telemetry/tests/marionette/tests/client/test_main_tab_scalars.py

@@ -13,6 +13,21 @@ def test_main_tab_scalars(self):
         """Test for Telemetry Scalars."""
 
         with self.marionette.using_context(self.marionette.CONTEXT_CHROME):
+            
+            
+            
+            
+            
+            self.marionette.execute_script(
+                """
+                const { BrowserUsageTelemetry } = ChromeUtils.import(
+                    "resource:///modules/BrowserUsageTelemetry.jsm"
+                );
+
+                BrowserUsageTelemetry._onTabsOpenedTask._timeoutMs = 0;
+                """
+            )
+
             start_tab = self.marionette.current_window_handle
 
             tab2 = self.open_tab(focus=True)