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!!!.
41,185 users
Tooltip Dictionary
찾고자 하는 단어에 마우스를 올리면 툴팁으로 사전을 제공합니다 현재 지원 언어: 영한 아이콘으로 쉽게 옵션을 조정할 수 있습니다
361 users
English (US) Dictionary
English (US) dictionary based on the official Mozilla dictionary.
121,556 users
French spelling dictionary
Spelling dictionary for the French language.
269,883 users
English United States Dictionary
English United States (en-US) Dictionary as shipped with Firefox 115 ESR.
376,804 users
Hungarian Dictionary
This extension is based on László Németh's Hungarian Dictionary
19,473 users
Bulgarian Dictionary
Bulgarian spellchecking...
14,410 users
Mouse Dictionary
Super fast dictionary
3,720 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.
203,467 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.
22,801 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.
27,880 users
Spanish (Mexico) Dictionary
Spanish (Mexico) spell checker dictionary
12,663 users
Reverso – Translation, dictionary
Translate and learn languages while browsing and watching movies, it’s free.
13,133 users
Arabic spell-checking dictionary
Arabic spell-checking dictionary for Firefox 3 and Thunderbird 3 from Ayaspell.
25,854 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.
130,177 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".
9,032 users
Latin Dictionary
Latin dictionary
985 users
English (Australian) Dictionary
Australian English Dictionary for Mozilla applications.
13,424 users
Mate Translate – translator, dictionary
Your all-in-one translator for web pages, highlighted text & Netflix subtitles. Translate and learn words in 103 languages.
33,390 users
Greek spellchecking dictionary
Greek spellchecking dictionary Mozilla (Firefox- Thunderbird- Seamonkey)
14,646 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/
497 users
Life Science Dictionary Tool
ライフサイエンス辞書ツールは、Webページ中の広範囲な生命科学用語を翻訳することが出来るマウスオーバー辞書です。ライフサイエンス辞書プロジェクト( https://lsd-project.jp/ )によって収集された10万語の英語用語、11万語の日本語用語を、用例・遺伝子情報などと共にご利用いただけます。 本アドオンはFirefox57以降での動作に対応したWebExtension版です。旧ライフサイエンス辞書とは動作が異なる部分がありますので、ご注意ください。
584 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.
4,537 users
Icelandic Dictionary
Icelandic Dictionary
960 users
Brazilian Portuguese Dictionary (New Spelling)
The same spellchecker shipped with the Brazilian version of Firefox.
72,852 users