Hi guys, there is a famous plugin called "Sessionsaver" that lets you to save the current tabs open in firefox, so that, when you open firefox next time, all the previously tabs are preserved. I discovered a patch for Sessionsaver for firefox 2.0. Get it from http://wolcano.platon.sk/sessionsaver/.
By the way, I'm still bewildered as to why this basic feature is not implemented in firefox yet.