Since the update to FF 140 I had double checkmarks (the standard Firefox one and the MIP one) for checked menu items. This change solved it:
In mip_FuguePlus-Menus.css I changed this line
menuitem[checked=true] > hbox.menu-iconic-left { display: none; !important } to this one
menuitem[checked=true] > .menu-icon { display: none !important }
Since the update to FF 140 I had double checkmarks (the standard Firefox one and the MIP one) for checked menu items. This change solved it:
In mip_FuguePlus-Menus.css I changed this line
menuitem[checked=true] > hbox.menu-iconic-left { display: none; !important }to this onemenuitem[checked=true] > .menu-icon { display: none !important }