/* Square tabs */
.tabbrowser-tab:not([pinned]), .tabs-newtab-button {	
    margin-left: 2px !important;
    margin-right: 2px !important;	
    border: 3px solid rgba(200,0,0,0.0) !important;
    border-radius: 0!important;
}

.tabbrowser-tab[pinned]
{	
    border: 3px solid rgba(200,0,0,0.0) !important;
    border-radius: 0!important;
    min-height: 19px !important;
}

/* Orange border */
.tabbrowser-tab[selected][fadein] {
    -moz-border-top-colors:   #E04613 !important;   
}

.tabbrowser-tab:not([selected])[fadein], .tabs-newtab-button {
    -moz-border-bottom-colors:   #E04613 !important;    
}