The "Classic" theme was still very much reminiscent of Netscape 4 (just reworked icons and toolbar and location bar were merged), while the "Modern" theme was m

The "Classic" theme was still very much reminiscent of Netscape 4 (just reworked icons and toolbar and location bar were merged), while the "Modern" theme was much the same in layout but introduced round buttons of varying size. (Firefox came with both themes.)