I just tried this tip from cnet.com with Logos and it works great! I thought some of you might be interested. No add-on is needed.
1. Customize search with Smart Keywords A little-known Firefox feature lets you run searches within any
given Web site from the browser's address bar. For example, to search
for "TouchPad" within Amazon.com, all you'd have to do is type "amazon
touchpad" in the Firefox bar.[or to find pauline within Logos.com just type logos pauline in the firefox bar.]
To create a smart keyword, head to a Web site and locate the search
field. Then, right-click the search field and select "Add Keyword for
this search...". Create the bookmark, store it in a folder, and your
smart keyword is now enabled. Try it with reference sites like Wikipedia
and IMDB for quick access to answers.