Firefox add-on with keyword - spelling

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.

Spelling dictionary for the French language.

The same spellchecker shipped with the Brazilian version of Firefox.

English-Greek spell-checking dictionary for Firefox, Mozilla thunderbird and Seamonkey mail for easier spell checking in bilingual text.If you need better spelling results try the respective stand-alone...

Lithuanian spellchecking dictionary for Mozilla applications, maintained by the ispell-lt project. Included by default in Lithuanian localized versions of Mozilla software.

Automatically changes the dictionary used for spell checking based on the language of text in input fields.

The same spellchecker shipped with the Brazilian version of Firefox, just using the former spelling (valid until January 1st 2016).

Arabic spell-checking dictionary for Firefox 3 and Thunderbird 3 from Ayaspell.

Upper Sorbian dictionary for use with the Mozilla spell checker

Combined Greek - English (US) spell checking dictionary for Firefox - Thunderbird - Seamonkey

Check your texts for grammar, spelling, or punctuation mistakes. Polish up your writing with style and synonym suggestions!

Hebrew spell-checking dictionary for Firefox and Thunderbird. Generated from data of the HSpell project version 1.4, and distributed freely under the AGPLv3.

Check Odia spelling and suggest modification.

Hausa spelling dictionary

Διορθωτὴς πολυτονικῶν κειμένων σύμφωνος μὲ τὴν ἑλληνικὴ ἱστορικὴ ὀρθογραφία.

Add-on for spell checking Lingala text.

German Dictionary according to the classical spelling standards for spell-checking in Firefox and Thunderbird

Slovak spell checking dictionary for Mozilla applications (based on the "open-source" dictionaries by Zdenko Podobný).

Enables spell-checking in Khmer

Afrikaans spell checker for Mozilla Firefox and Thunderbird

Select a text in German and perform a quick spell check. <=> Wählen Sie einen Text in Deutsch aus und führen Sie eine schnelle Rechtschreibprüfung durch.

Hints for the NYT Spelling Bee

Kannada Spell Checker

This is a real time spell checker for Hindi, supported on Firefox, Thunderbird, and Seamonkey.

Gujarati Spell Checker