PopUp Encyclopedia от Parth Parikh

Popup Encyclopedia is a blazingly fast dictionary/encyclopedia which can be used to search any word or collection of words. It supports double-click-on-text navigation. Double-click-on-text navigation is a feature by which you can double-click on any text in the popup window to get it's meaning without having to type it again in search box. [ Note: As of Ver 2.2, this feature is only available on the toolbar popup. ]

The features are:

• Works offline as a dictionary.
• Supports word-lemmatization and word-stemming to increase accuracy.
• Clean and minimalistic UI.
• Double-click-on-text navigation.
• Cross platform extension. Works well in Firefox, Chrome and Opera.
• For keyboard ninjas, ALT + SHIFT + M is the shorcut key.

This is an open source extension. Issues and pull requests can be submitted here.

Version 2.2
New popup design
Added Lemmatization support to increase accuracy
Fixed issues with acronyms

Version 2.1
Links will now be displayed in the in-display popup.
Minor design changes

Version 2.0
Click any text to see the popup come alive!