Bug 1321865 - Enable IntersectionObserver. r=smaug

--HG--
extra : source : 3ae78eda5a0c2f2b0f57650e9b62656e11818a3c

modules/libpref/init/all.js

@@ -5562,4 +5562,4 @@ pref("prompts.authentication_dialog_abuse_limit", 3);
 // To enable the DOM implementation, turn on "dom.storageManager.enabled"
 pref("browser.storageManager.enabled", false);
 
-pref("dom.IntersectionObserver.enabled", false);
+pref("dom.IntersectionObserver.enabled", true);