Even setting the usual Firefox pref (dom.event.contextmenu.enabled = false) doesn't fix this. I had to install Absolute Enable Right Click https://addons.mozill

Even setting the usual Firefox pref (dom.event.contextmenu.enabled = false) doesn't fix this. I had to install Absolute Enable Right Click https://addons.mozilla.org/en-US/firefox/addon/absolute-enable-right-click/ https://addons.mozilla.org/en-US/firefox/addon/absolute-enab... and configure it to "absolute" mode to get a normal menu.