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Wiktionary (en)
Search Wiktionary.org, the free-content multilingual dictionary quickly and easily - and without wasting time and bandwidth on ads.
The Free Dictionary Search
Helps you search for word definitions at TheFreeDictionary.com
SnappyWords Visual Dictionary
Snappy Words is a Free Interactive English Dictionary and Thesaurus that allows you to finding meaning of words and other associated words in a visually interactive display. Lookup a word and see other related words of main query, each with meaning.
Dictionnaire des synonymes FR Requires Restart
Adds to browser French(FR) synonyms dictionary from package LibreOffice.
Synonym-Wörterbuch DE Requires Restart
Adds to browser German(DE) synonyms dictionary from package LibreOffice.
Diccionario de sinónimos ES Requires Restart
Adds to browser Spanish(ES) synonyms dictionary from package LibreOffice.
Słownik synonimów PL Requires Restart
Adds to browser Polish synonyms dictionary from package LibreOffice.
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.
Synonyms dictionary EN-US Requires Restart
Adds to browser English(US) synonyms dictionary from package LibreOffice.
To create your own collections, you must have a Mozilla Add-ons account.