MakeUseOf has already covered a number of search engine comparison tools. These include Google vs. Yahoo, Google vs. Bing and Google vs. Wolfram-Alpha.

This time we present you one cool Firefox add-on that can easily replace them all. It unifies popular search engines like Bing, Wolfram, Wikipedia, Delicious and Stumbleupon in one place and lets you compare side-by-side with Google.

Once you have it installed simply go to Google and search for something, on the search results page you should see a toolbar displaying different search engines. Clicking on the particular engine will open results from that engine next to the search results from Google. You may easily switch between search engines with a single click.

Features:

• Compare search results from popular search engines against Google.
• Supported engines are Bing, Wolfram, Wikipedia, Delicious and Stumbleupon.
• Switch between engines with a single click.
• Simple and easy to use.
• Currently works only with Firefox.

Check out UnifiedSearch @ http://addons.mozilla.org/en-US/firefox/addon/12546