Browser information (bookmarks, browsing history, passwords, ...) are available for Firefox and add-ons with Mozilla or a server that can be your own.
The information sent to the server is secure and can not be accessed by anyone even by the server. It protects the password.
Connecting with the wave server connects with a specific timeframe, depending on the user's needs. If you access it from a computer only, it connects every 24 hours, if you access it from multiple computers, it will connect several times a few times.
Mozilla Firefox is a very attractive add-on that lets you enjoy your settings from different computers.