fixed issue #250

Former-commit-id: 605669f84c36a99315089984b4980bf2fa95c39e

lib/hooks/content/content-hooks-frames-web.js

@@ -301,7 +301,7 @@
 				intersectionObserver.unobserve = function (targetElement) {
 					let targetElements = observedElements.get(intersectionObserver);
 					if (targetElements) {
-						targetElements = targetElements.filter(element => element <= targetElement);
+						targetElements = targetElements.filter(element => element != targetElement);
 						if (targetElements.length) {
 							observedElements.set(intersectionObserver, targetElements);
 						} else {