LubeMonkey is a fork of Greasemonkey with SQLite database client side storage.
Firefox is using an SQLite database to store various things of your everyday browsing experience in an sqlite database. Bookmarks, settings etc get stored on a central SQLite database. Greasemonkey also stores his variables in this central storage.
Lately I discovered that other scripters make also extensive use of this variable storage, every greasemonkey script tries to create a local storage for games and other data that have to be accessed over and over again.
Find an example using Lubemonkey here.
Download Lubemonkey from Mozilla addons page here
