One reason I enjoy using Opera at times, is because it if I close it with 5 tabs open and then open it back up then all five will open back up again. The fact that I couldn’t get Firefox to do this was most always a bother. Well it seems now with Firefox 2 you can.

Go to Tools >Options and in the “Startup” area select the drop down box beside “When Firefox starts” and select “Show my windows and tabs from last time.”

Show my windows and tabs from last time

I noticed that when Firefox closed unexpectedly it prompts you about whether you want to reopen the start page or all the tabs you had open. A little searching revealed this. By the way…nothing against Opera, I still enjoy using it at time…but overall I prefer Firefox.
Enjoy