I can make Firefox not display the ugly dotted focus outlines on links with this:
a:focus {
outline: none
Along with Bootstrap 3 I used this code. The second set of rules just undo what bootstrap does for focus/active buttons:
button::-moz-focus-inner {
border: 0; /*removes dotted lines around buttons*/
}
.btn.active.focus, .btn.active:focus, .btn.focus, .btn.focus:active, .btn:active:focus, .btn:focus{
outline:0;
}
NOTE that your custom css file should come after Bootstrap css file in your html code to override it.