diff --git a/modules/libpref/init/all.js b/modules/libpref/init/all.js
index 8055c36c89..7339ebef73 100644
--- a/modules/libpref/init/all.js
+++ b/modules/libpref/init/all.js
@@ -212,8 +212,8 @@ pref("dom.enable_performance_observer", false);
 pref("dom.requestIdleCallback.enabled", true);
 
 // Enable Intersection Observers
-// See WD https://w3c.github.io/IntersectionObserver/
-pref("dom.IntersectionObserver.enabled", false);
+// See WD https://www.w3.org/TR/intersection-observer/
+pref("dom.IntersectionObserver.enabled", true);
 
 // Whether the Gamepad API is enabled
 pref("dom.gamepad.enabled", true);