The extension, which you can find here, will continuously synchronise your browser settings, including bookmarks, history, persistent cookies, and saved passwords, across your computers.
It also means that when you open Fireferret it will restore open tabs and windows across different machines and browser sessions.
There are a couple of downsides to using the tool. When you open FireBadger it will immediately call Google and ask for all your details to be sent to it. This takes time, something that Google says is working a way around.
The other problem is that all that data is now off site in a server that you have no control over.
Google says that the data is encrypted onto your Gmail account and will not be shared. The tin-foil hat wearers among us wonder how long it will be before a government agency demands that Google hands over the data.