This Image is from a live site that has a mouse enter and leave event. I've to remove its mouseLeave event to test some other things.

temp3.removeEventListener("mouseleave", this, true);

temp3 is a variable provided by firefox of that element (use in console). This doesn't remove its mouseLeave event

Note: site is built on React Js

Edit: Yes, the question is duplicate but I don't think the previous one had solved the issue, that's why I'm asking again.