LibX is a browser plugin for Firefox and Internet Explorer that provides direct access to your library's resources. Hundreds of so called "public editions" for different libraries are available.
The Stanford U edition adds a new toolbar with the same search options that Socrates provides. It supports off-campus access wit proxy and search in Google Scholar.
Learn more about this new Firefox plug-in at Stanford.
And here is a direct link to install LibX
Stanford University Edition Version 1.2.2.