setInterval/setTimeout and print preview in Firefox

I am attempting to control a picture change sequence using setInterval (or setTimeout). I find that in Firefox, if the user goes into print preview, then returns to the browser, any setinterval sequence is lost or setTimeout event no longer happens. IE and Opera seem to handle this without problems. Is there anyway to overcome this or get the sequence restarted? Unfortunately the onbeforeprint/onafterprint events are not supported in Firefox.

Sounds more like a bug to me. I would report this directly to Mozilla.