This should do it:
window.open("http://example.com", "name", "scrollbars=1,width=100,height=100");
but note that Firefox will only show scrollbars when the content is larger than the window.
To force Firefox to always show a scrollbar (like Internet Explorer does) you need this in the stylesheet of the HTML that's being shown in the popup:
html {
overflow: -moz-scrollbars-vertical;
}
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