Dictionary Anywhere
View definitions easily as you browse the web. Double-click any word to view its definition in a small pop-up bubble. It also supports Spanish, German, French language alongside English. Enjoy Reading Uninterrupted!!!.
41,354 users
French spelling dictionary
Spelling dictionary for the French language.
296,309 users
French-Current (FRANCE) spell checker Dictionary
Only ONE dictionary it's enough ! This one will spell french in a way that most France's people do today — June 2014 Edition .
265 users
English (US) Dictionary
English (US) dictionary based on the official Mozilla dictionary.
128,939 users
English United States Dictionary
English United States (en-US) Dictionary as shipped with Firefox 115 ESR.
387,160 users
Hungarian Dictionary
This extension is based on László Németh's Hungarian Dictionary
19,609 users
Bulgarian Dictionary
Bulgarian spellchecking...
15,901 users
Mouse Dictionary
Super fast dictionary
3,842 users
ImTranslator: Translator, Dictionary, TTS
COMPLETELY REDESIGNED TRANSLATOR FOR FIREFOX ImTranslator translates text, words, webpages between more than 100 languages. NEW: Inline Translator, Dictionary, access to Google Translate, Microsoft Translator. Unique on the fly localization.
133,181 users
British English Dictionary (Marco Pinto)
A fork of Mark Tyndall's add-on, based on David Bartlett's British Dictionary R1.19 for Firefox, Thunderbird and SeaMonkey. V3.3.2 has 140 000+ new words and also fixes.
208,422 users
British-English Dictionary (GB)
A strict British-English spell checker dictionary for Firefox, Thunderbird and SeaMonkey. This dictionary only includes words conforming to the preferred standard of British-English spelling.
23,976 users
Canadian English Dictionary
For some reason, Mozilla doesn't have a Canadian localization team, but I know that even the British dictionary doesn't quite cut it for the truly patriotic.
27,873 users
Spanish (Mexico) Dictionary
Spanish (Mexico) spell checker dictionary
12,785 users
Reverso – Translation, dictionary
Translate and learn languages while browsing and watching movies, it’s free.
13,487 users
Arabic spell-checking dictionary
Arabic spell-checking dictionary for Firefox 3 and Thunderbird 3 from Ayaspell.
26,558 users
Grammar and Spell Checker - LanguageTool
With this extension you can check text with the free style and grammar checker LanguageTool. It finds many errors that a simple spell checker cannot detect, like mixing up there/their, a/an, or repeating a word.
343,371 users
British English Dictionary
British English Dictionary R1.19 for Firefox, Thunderbird and SeaMonkey by David Bartlett. To enable, right-click in a multi-line text box, select "Languages", then "English / United Kingdom".
9,151 users
Latin Dictionary
Latin dictionary
1,028 users
Greek spellchecking dictionary
Greek spellchecking dictionary Mozilla (Firefox- Thunderbird- Seamonkey)
18,199 users
English (Australian) Dictionary
Australian English Dictionary for Mozilla applications.
13,450 users
The Free Dictionary
Double-click a word on any website and instantly get its definition at TheFreeDictionary.com, the world's most comprehensive dictionary! Or use the search bar to search directly from the browser toolbar.
367 users
Mate Translate – translator, dictionary
Your all-in-one translator for web pages, highlighted text & Netflix subtitles. Translate and learn words in 103 languages.
34,055 users
Urdu Dictionary
This dictionary is based on the urdu word list provided at www.crulp.org and the word list compiled by our friends at http://www.urduweb.org/mehfil/
485 users
enUS deDE bilingual dictionary
This is a bilingual dictionary for American English and German Standard German. It is meant for users who regularly write in German and English. With it, you will not need to manually switch between dictionaries for the two languages.
4,757 users
Brazilian Portuguese Dictionary (New Spelling)
The same spellchecker shipped with the Brazilian version of Firefox.
76,469 users