diff --git a/how-many-tabs-do-you-have-open.md b/how-many-tabs-do-you-have-open.md
index 6d5a264f4..df13dca6b 100644
--- a/how-many-tabs-do-you-have-open.md
+++ b/how-many-tabs-do-you-have-open.md
@@ -1,5 +1,6 @@
 # how many tabs do you have open?
 
 - a [[poll]]
-
+  - on [[firefox]], you can visit about:telemetry#scalars-tab, check max_concurrent_tab_count
+   
 https://twitter.com/flancian/status/1388866515676639233
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