diff --git a/modules/libpref/init/all.js b/modules/libpref/init/all.js
index 20e8bca0ea..f66f64bec3 100644
--- a/modules/libpref/init/all.js
+++ b/modules/libpref/init/all.js
@@ -210,7 +210,7 @@ pref("dom.requestIdleCallback.enabled", true);
 
 // Enable Intersection Observers
 // See WD https://w3c.github.io/IntersectionObserver/
-pref("dom.IntersectionObserver.enabled", true);
+pref("dom.IntersectionObserver.enabled", false);
 
 // Whether the Gamepad API is enabled
 pref("dom.gamepad.enabled", true);