Getting rid of that damn image border in Firefox, not working

Question

Ok, I've tried all 3 solutions, still not working, wondering if it is over written somewhere else, using Bootstrap 3.0. Seems so simple, yet driving me a bit bonkers.

1. :focus { -moz-outline-style: none; }

2. * { outline: none; }

3.

img {
    border:0;
    outline:none;
}

None of these solutions seem to be working.

Answer 1

in file bootstrap.min.css comment

a:focus {
  outline: thin dotted;
}