Google Browser Sync Extension For Firefox
Google recently announced a new Firefox extension which allows you to synch your open windows between different firefox installations. Now you can start reading all of your blogs before you head into work and not worry about losing your place. When you get to work, you can sync up your browser and continue where you left off.
Inside Google has addressed some problems and security issues that may arise when using the sync extension. One problem is going to be keeping the session state on some pages alive between the browsers.
In conclusion, I would say that this is one of the more useful extenstions that I have seen developed for firefox. I'll give it a try and let you know how it goes. For more information see the FAQ or the official announcement.