diff --git a/user.js b/user.js
index 5fc283a..c4152de 100644
--- a/user.js
+++ b/user.js
@@ -1082,13 +1082,6 @@ user_pref("javascript.options.wasm_trustedprincipals", false);
 user_pref("javascript.options.wasm_verbose", false);
 user_pref("javascript.options.wasm_multi_value", false);
 // -------------------------------------
-// Pref : Disable Intersection Observer API
-// Almost a year to complete, three versions late to stable (as default false), number #1 cause of crashes in nightly numerous times, and is (primarily) an ad network API for "ad viewability checks" down to a pixel level
-// https://developer.mozilla.org/docs/Web/API/Intersection_Observer_API
-// https://w3c.github.io/IntersectionObserver/
-// https://bugzilla.mozilla.org/1243846
-user_pref("dom.IntersectionObserver.enabled", false);
-// -------------------------------------
 // Pref : Disable Shared Memory (Spectre mitigation)
 // https://github.com/tc39/ecmascript_sharedmem/blob/master/TUTORIAL.md
 // https://blog.mozilla.org/security/2018/01/03/mitigations-landing-new-class-timing-attack/