Using FF 67.0-64bit. I Installed this add-on but cannot find any interface that allows me to change the color of the Facebook page. On the facebook page itself, there is no icon to change the color. In firefox, all I get it when I select the FF menu icon ≡ and then select the "puzzle" icon for add-ons , is the list of all my add-ons that have been installed. The Color Changer does not have an options button.