Important Note

I stopped developing this extension because Mozilla changed the API for Firefox completely. Since the developers at forked my code some years ago for providing the exactly same extension as mine - without contacting me for community work - it makes no sense for me porting my code to the new API. Maybe I will fork their code some day to add my keyboard shortcut feature but I don't know actually. I am not interested in co-working with them anymore and am not using as translation service anymore. My extension had about 10.000 users and I got about 20$ since 2005 for many hours of learning the Mozilla API and writing the code... :(


Screenshot: Leo Search Plugin

Searches for marked words in the database at and opens the result in a new tab. The fastest way to search at It supports English, French, Spanish, Chinese, Italian Russian, Polish and Portuguese to German translation.

Since I am using very much every day and I really needed a very simple way to search the database at, I decided to write my own - context menu based - addon for Firefox. It simply searches for selected words and opens the result in a new tab or window.


Please download this extension at


The source code of Leo Search is available at

git clone