WikiLook add-on for -firefox

Today I came across a very nice and handy add-on for Firefox called WikiLook

A very fast way to define words in any webpage. Just press Ctrl or Shift or Alt and make a RightMouseButton click on a word.

Defaults: Shift+right-click is a Wiktionary lookup, Ctrl+right-click is a Wikipedia lookup, Alt+right-click is Uncyclopedia lookup.