Ah, now I see. It's because my LJ style doesn't explicitly open a <p> tag between the innermost <td> and the string of images, whereas other styles do. Adding an explicit <p> turns on the wrapping behaviour even in Firefox 2, whereas Safari was happy to wrap regardless. I've now fixed my style; thanks for giving me the hint that it was something I could fix at my end!
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<p>tag between the innermost<td>and the string of images, whereas other styles do. Adding an explicit<p>turns on the wrapping behaviour even in Firefox 2, whereas Safari was happy to wrap regardless. I've now fixed my style; thanks for giving me the hint that it was something I could fix at my end!