Remove shadow on tabs when a dark Persona enabled
Remove shadow on tabs when a dark Persona enabled

gnome-integration-team/firefox-gnome,synapsos/firefox-gnome,synapsos/firefox-gnome,synapsos/firefox-gnome,lbrfabio/firefox-gnome-flat,gnome-integration-team/firefox-gnome,synapsos/firefox-gnome,lbrfabio/firefox-gnome-flat,gnome-integration-team/firefox-gnome,lbrfabio/firefox-gnome-flat,gnome-integration-team/firefox-gnome,lbrfabio/firefox-gnome-flat