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-rw-r--r--modules/libpref/init/all.js4
1 files changed, 4 insertions, 0 deletions
diff --git a/modules/libpref/init/all.js b/modules/libpref/init/all.js
index 8ef75e360..ddff087ed 100644
--- a/modules/libpref/init/all.js
+++ b/modules/libpref/init/all.js
@@ -208,6 +208,10 @@ pref("dom.enable_performance_observer", false);
// Enable requestIdleCallback API
pref("dom.requestIdleCallback.enabled", true);
+// Enable Intersection Observers
+// See WD https://w3c.github.io/IntersectionObserver/
+pref("dom.IntersectionObserver.enabled", true);
+
// Whether the Gamepad API is enabled
pref("dom.gamepad.enabled", true);
pref("dom.gamepad.test.enabled", false);