One of Firefox’s nicer features is the ease with which users can look up Wikipedia, IMDB or Amazon with the Firefox Search Bar. Adding a custom search engine takes only a few mouse clicks.

Opera has a similar feature but you need to do a little extra work. Angsuman Chakraborty has instructions for adding a custom search engine to Opera. For specific instructions on how to add Wikipedia as a custom search engine, you can check out Wikipedia itself.

After doing that, I now have the ability to search Wikipedia directly from Opera’s address bar.