diff --git a/Common-Overrides.md b/Common-Overrides.md
index c29752e..514310d 100644
--- a/Common-Overrides.md
+++ b/Common-Overrides.md
@@ -144,6 +144,11 @@ Enable containers if you want to login to the same site under different accounts
 ```javascript
 // PREF: enable Container tabs
 user_pref("privacy.userContext.enabled", true);
+
+// PREF: set behavior on "+ Tab" button to display container menu on left click [FF74+]
+// [NOTE] The menu is always shown on long press and right click.
+// [SETTING] General>Tabs>Enable Container Tabs>Settings>Select a container for each new tab
+user_pref("privacy.userContext.newTabContainerOnLeftClick.enabled", true);
 ```
 
 ***