Select some text in WP and search for it in any one or more of a selection of research web sites, including some specific to legal reference.
Sites available for search are:
Google Scholar articles
Google Scholar legal
US Library of Congress
Others can be added on request. I tried to include Fastcase, but their web site is structured in a way I could not work with, and Casemaker did not respond to my two requests for a 24-hour trial.
The distribution contains scripts for both Sheepshaver/Intel and Classic. Due to what seems to be an issue with folder actions, the Sheepshaver script can only send a search request to one web site at a time.
Free in the Files section here.