Firefox add-on KwiClick lets you perform searches in a small additional browser window, making searches faster and less obtrusive, as you don’t have to open a new tab or window, or leave the page that you’re on. KwiClick can search using Google (s goog), YouTube, Twitter, Wikipedia and more. To demonstrate how it works, I recorded a quick screencast showing it in action:
KwiClick is free, works with Firefox 3+ and can be downloaded from the Mozilla Add-ons site.
Let us know what you think of KwiClick in the comments.