I dont have the new version of firefox with builtin session restore, but I use google browser sync wich does the same thing.
It will sync EVERYTHING (except extensions
)between every machine you have firefox running on.. stored passwords, cookies, and your session.
Pretty cool how I can close out all my windows at work, go home and restore all the sites and tabs i had open before at the office!
http://www.google.com/tools/firefox/browsersync/