Consider this post an evolving receptacle for Firefox-specific CSS tricks. Change the color of highlighted text *::-moz-selection { background: #FF3C00; /* the background color of the highlight */ color: #FFF; /* the color of the text within the highlight */ } Change the opacity of an element div#division { /* choose either attribute */ -moz-opacity: 0.99; /* possible values: 0-1 */ -moz-opacity: 99%; /* possible values: 0%-99% */ } Control item selection of an element div#division { [...] • Read more »