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Wikipedia (SSL)
Wikipedia is an openly-editable, free content internet encyclopedia. This search bar add-on utilizes SSL to protect searches between You and Wikipedia.
The Free Dictionary Search
Helps you search for word definitions at TheFreeDictionary.com
Spific - Customized Google search
Take your "Googling" to the max with Spific! By using Spific you gain access to thousands of hours of human categorization of search results as well as many powerful but hidden Google features.
Give it a try - We're sure you'll like it!
ArticlesWave.com
Search 100s of informative and educative articles and videos on a wide array of topics like health and fitness, lifestyle, entertainment, sports, business, investing, travel, etc.
WikiLook Requires Restart
Leading dictionary lookup add-on. Fast, light, open source tool that define words for you without need to open new tabs or windows. Wiktionary&Wikipedia.
Ctrl or Shift or Alt + RightMouseButton click. Now with thesaurus.
70+ languages supported!
Lexiology.com Dictionary
Lexiology.com Dictionary of American English: This dictionary has a very nice Web 2.0 browse interface. It contains definitions/meanings, audio, phonetics, usages and other information. Searched word can be added in the personal word-list.
New Advent
New Advent has the most complete online library of the Catholic Encyclopedia, Summa Theologica, and Fathers of the Church, plus a daily round-up of Catholic news and blogs.
Smart Define Search
Add Smart Define to Firefox's search bar. Get a quick access to smartdefine.org dictionary and thesaurus when you need to find the best definitions and word meanings.
Encyclopedia - get more than Wikipedia!
More than Wikipedia!
You get results from: Wikipedia, Encyclopedia Britannica, Answers.com and other encyclopedias.
Better research!
ע\ع (Ayn\Ayn) Lookup [former ע\ع Converter] Requires Restart
GP text research tool: transliterates Arabic/Syriac/Aramaic texts to Hebrew writing system, uses Wikipedia as a dictionary utilizing ¨see in anther language¨ links. Interface to dictionaries and encyclopedias. Select a text and use the context menu.
Books
Find a book an e-book, audiobook, book store, bestseller, magazine or a novel.
www.sequere.net/books/
To create your own collections, you must have a Mozilla Add-ons account.