How to change default separator icon in Bootstrap 3 Breadcrumbs?

And now with bootstrap 4

    .breadcrumb-item + .breadcrumb-item::before {
       color: green;
    }

This is not icon, you can add what ever you want, icon, image etc.

.breadcrumb > li + li:before {
    color: #ccc;
    content: "/ ";
    padding: 0 5px;
}

Change content to " >> " and see

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