QuickWiki is a handy experimental Firefox add-on for users who work with Wikipedia and Wiktionary regularly. The Firefox add-on adds a quick look up feature into the web browser that can be used to quickly gain information about a selected word or phrase on a website. QuickWiki opens the information that it has retrieved in an overlay on the same page unlike other add-ons that open the information in a new tab or window.
The results are shown pretty fast, it usually took less than a second for them to be displayed on the page. The Firefox add-on makes use of three different keyboard and mouse shortcuts. Pressing Shift and clicking the right-mouse button will look up the selected word in Wiktionary, while Ctrl and the right-mouse button will look it up in Wikipedia. The last shortcut can be used to open the quick search dialog. The shortcuts can be customized which might be necessary depending on other add-ons installed on the computer.

QuickWiki is an experimental Firefox add-on. This means that it can only be downloaded and installed after logging into the Mozilla website. It has to be noted that the add-on is currently only working with the English language portals of both Wikipedia and Wiktionary.

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Ferry (ferry) cool link Martin. Thanks!
cant install
I think that the last versions of QTL are better. In addition to dictionary translation look, they have option to look in Wiki and Wiktionary too, and – in the localized wikis and wiktionaries. So, they have plenty options to find “what does it mean” :)
HI ! My name is Jean Louis Gallier . I would like to integrate wikipedia in my MOZILLA FIREFOX. How must I proceed ? Could you be so kind as to help me in this attempt. I would be grateful to you if you would!
Best regards!
Jean Louis Gallier