'''Main issue:''' Firefox default pop-up menu style is ugly. I want to change this with custom CSS code or Just like Chrome . Is there any way to change this? Please show me any single way, I just want to change this. This bothering me too much. '''Second Issue''': Firefox showing me a pop-up menu twice ( [https://imgur.com/J7bUAxE please check the video] ). But Why? How to get rid of it. On the other hand, chrome is showing just a simple pop-up menu once. Note: I like Firefox , that's why I want to style this, I don't want to use chrome. Thank you