Some quick thinking by the creator of this new add-on... There's a new FireFox add-on that displays Wolfram Alpha results in Google searches.

For example, if you search for "all countries" on Google, you'll see the regular Google results, as well as Wolfram's list of all countries in the world. If there are no results on Wolfram Alpha, then you'll only see Google results.

It would likely irritate me to have the add-on active all the time, but I can see how the add-on is handy for those who want to carry out a comparison between Google and Wolfram Alpha results.

Here's the link where you can download the Firefox add-on for Wolfram Alpha Google.

You can also read more about this add-on at Labnol.org.