Here are a few plugins that can help you find the information you are looking for faster by adding a couple add-ons to Firefox.

Context Search 0.4.3: This is a very handy add on that after you highlight a word on the page, you can search specific sites. Make sure you have added more than the default search sites here.

Search Cloudlet:
When you perform a search after installing this plugin, there will be a cloud of related search terms to help you further refine your search.

Search Everywhere: This plugin adds a button to the bottom of your browser that when you click it, allows you to (among many other features) limit your search to just that site. I find this one particularly helpful as i can usually remember where i read something but did not save the exact url.