Semantic search engine hakia has released an updated version of its toolbar, called the ScoopBar. The new version will highlight search terms on a web page visited as a result of clicking on a link in a search engine.
For example, let's say you do a search for "What happens to the coins thrown in the Trevi Fountain?" in Google. You get back your results. You click on a result.
Once you're on the result's web page, hakia ScoopBar will highlight the words on the page that are related to your search. This can help you find your answer more quickly.
To use the feature, the word "Highlight" must be selected in the toolbar. I was having trouble simply clicking to select (could just be the computer/version of Firefox I'm using), but you can look for the arrow next to the hakia logo - and use the drop-down menu to select as well.
ScoopBar is available as a plugin (aka add-on) for both Internet Explorer and Firefox.