By setting your preferences in Google Scholar to the University of Pennsylvania Library, you will see PennText links appear in Google Scholar results when fulltext is available through the Penn Library (example). This should not be necessary on campus, as Google should already have identified you as a Penn user. You will still be asked to login with your pennkey username and password.

PennText links will appear as PennText buttons in GoogleScholar when you have installed this extension.

Install Google Scholar PennText Extension for Firefox
NOTE:  The current version of the GoogleScholar Widget cannot be installed in versions of Firefox above 1.0. We are working to address this incompatibility.

Installation: When you try to install the toolbar, a yellow bar will appear at the top of your screen alerting you that you are attempting to install software. Click "Edit Options" and "Allow" to let your browser know that it is safe to install extensions from the labs.library.upenn.edu site. Once you have allowed the install, click on install again to install the extension.