XenoWikipedia is an address field (aka omnibox) extension that lets you easily lookup things in the various language variants of the Wikipedia.org online encyclopedia.
Type ”wx“ into the address field followed by a space separated optional edition- or language code and the token you are referring Wikipedia for.
For example type:
wx de xeno
Get it from the Opera Addon repository:
Get it as extension from the Google™ Chrome Web Store: