Firefox context menu overshadows web page context menu in Ubuntu

I am setting up an Ubuntu touch panel.This panel is going to provide a web access for user to a web server in a controller. Webserver has a specific context menu which enable user to override parameters.I tested this web page in different OSes and browsers and it works perfect. That means whenever a user right click on a data it opens specific context menu to override the data. I setup the touch panel locally , and it was working without an issue, but now that I am connecting with tightVNC, right click opens the Firefox context menu over the webpage-specific ones. Even local user tried it on touch panel with the same result. I know the context menu is there, but it is covered by Firefox ones.Is there any way to totally disable Firefox context menu, so right click only show the web page context menu?
Ubuntu Version: 22.04Firefox Version:124.0.2about:Config > dom.event.contextmenu.enabled=True