Adict

Instant dictionary lookup extension for Firefox and Chrome

This extension allows you to easily look up a phrase in English, Polish, German, Spanish or French holding ALT and double clicking or with a button. You can choose one of the four available dictionaries: dictionary.com (EN), merriam-webster.com (EN), diki.pl (EN/PL) and and bab.la (EN, PL, DE, ES, FR).

Download from Firefox Addons and Chrome Web Store:

https://addons.mozilla.org/en/firefox/addon/adict/

https://chrome.google.com/webstore/detail/adict-instant-dictionary/npehaobgogknjhoglakcpbfbhfdgennf