--- a/modules/libpref/init/all.js
+++ b/modules/libpref/init/all.js
@@ -5547,9 +5547,8 @@ pref("dom.storageManager.enabled", true)
 #else
 pref("dom.storageManager.enabled", false);
 #endif
 
 // Enable the Storage management in about:preferences and persistent-storage permission request
 // To enable the DOM implementation, turn on "dom.storageManager.enabled"
 pref("browser.storageManager.enabled", false);
 
-pref("dom.IntersectionObserver.enabled", true);