字典與語言套件
安裝字典附加元件後，會在您的拼字檢查器當中新增語言選項，讓您可在 Firefox 打字時檢查拼字。
語言套件可更改您瀏覽器的介面語言，包含選單項目與設定內容。
所有語系
| 語系名稱 | 語言套件 | 字典 |
|---|---|---|
| Acholi Acholi | ||
| Afrikaans Afrikaans | ||
| Albanian Shqip | ||
| Arabic عربي | ||
| Aragonese aragonés | ||
| Armenian Հայերեն | ||
| Assamese অসমীয়া | ||
| Asturian Asturianu | ||
| Azerbaijani Azərbaycanca | ||
| Bambara Bamanankan | ||
| Basque Euskara | ||
| Belarusian Беларуская | ||
| Bengali বাংলা | ||
| Bengali (Bangladesh) বাংলা (বাংলাদেশ) | ||
| Bodo बर' | ||
| Bosnian Bosanski | ||
| Breton Brezhoneg | ||
| Bulgarian Български | ||
| Burmese မြန်မာဘာသာ | ||
| Catalan Català | ||
| Catalan (Valencian) Català (Valencià) | ||
| Chinese (Simplified) 中文 (简体) | ||
| Chinese (Traditional) 正體中文 (繁體) | ||
| Croatian Hrvatski | ||
| Czech Čeština | ||
| Danish Dansk | ||
| Dutch Nederlands | ||
| English (Australian) English (Australian) | ||
| English (British) English (British) | ||
| English (Canadian) English (Canadian) | ||
| English (New Zealand) English (New Zealand) | ||
| English (US) English (US) | ||
| Esperanto Esperanto | ||
| Estonian Eesti keel | ||
| Finnish suomi | ||
| French Français | ||
| Frisian Frysk | ||
| Friulian Furlan | ||
| Friulian Furlan | ||
| Fulah Pulaar-Fulfulde | ||
| Gaelic (Scotland) Gàidhlig | ||
| Galician Galego | ||
| Georgian ქართული | ||
| German Deutsch | ||
| German (Austria) Deutsch (Österreich) | ||
| German (Germany) Deutsch (Deutschland) | ||
| German (Switzerland) Deutsch (Schweiz) | ||
| Greek Ελληνικά | ||
| Guarani (Paraguay) GuaranÍ | ||
| Gujarati (India) ગુજરાતી (ભારત) | ||
| Hausa Hausa | ||
| Hebrew עברית | ||
| Hindi (India) हिन्दी (भारत) | ||
| Hungarian magyar | ||
| Icelandic íslenska | ||
| Indonesian Bahasa Indonesia | ||
| Interlingua Interlingua | ||
| Irish Gaeilge | ||
| Italian Italiano | ||
| Japanese 日本語 | ||
| Kabyle Taqbaylit | ||
| Kannada ಕನ್ನಡ | ||
| Kaqchikel Maya Kaqchikel | ||
| Kazakh Қазақ | ||
| Khmer ខ្មែរ | ||
| Korean 한국어 | ||
| Kurdish Kurdî | ||
| Lao ພາສາລາວ | ||
| Latin Latina | ||
| Latvian Latviešu | ||
| Ligurian Ligure | ||
| Lingala Lingála | ||
| Lithuanian lietuvių kalba | ||
| Lower Sorbian Dolnoserbšćina | ||
| Macedonian Македонски | ||
| Malagasy Malagasy | ||
| Malay Melayu | ||
| Maori (Aotearoa) Māori (Aotearoa) | ||
| Marathi मराठी | ||
| Mongolian Монгол | ||
| Ndebele, South isiNdebele | ||
| Nepali नेपाली | ||
| Northern Sotho Sepedi | ||
| Norwegian (Bokmål) Norsk bokmål | ||
| Norwegian (Nynorsk) Norsk nynorsk | ||
| Occitan occitan | ||
| Oriya ଓଡ଼ିଆ | ||
| Persian فارسی | ||
| Persian (Iran) (ایران) فارسی | ||
| Polish Polski | ||
| Portuguese (Brazilian) Português (do Brasil) | ||
| Portuguese (Portugal) Português (Europeu) | ||
| Punjabi (India) ਪੰਜਾਬੀ (ਭਾਰਤ) | ||
| Romanian Română | ||
| Romansh rumantsch | ||
| Russian Русский | ||
| Sanskrit संस्कृत | ||
| Santali ᱥᱟᱱᱛᱟᱲᱤ | ||
| Saraiki سرائیکی | ||
| Sardinian Sardu | ||
| Scots Scots | ||
| Serbian Српски | ||
| Serbian Српски | ||
| Serbian Srpski | ||
| Silesian Ślōnski | ||
| Sinhala සිංහල | ||
| Siswati siSwati | ||
| Slovak slovenčina | ||
| Slovenian Slovenščina | ||
| Songhai Soŋay | ||
| Southern Sotho Sesotho | ||
| Spanish Español | ||
| Spanish (Argentina) Español (de Argentina) | ||
| Spanish (Chile) Español (de Chile) | ||
| Spanish (Mexico) Español (de México) | ||
| Spanish (Spain) Español (de España) | ||
| Standard Moroccan Tamazight ⵜⴰⵎⴰⵣⵉⵖⵜ ⵜⴰⵏⴰⵡⴰⵢⵜ | ||
| Swahili Kiswahili | ||
| Swedish Svenska | ||
| Tagalog Tagalog | ||
| Tajik Тоҷикӣ | ||
| Tamil தமிழ் | ||
| Tamil (India) தமிழ் (இந்தியா) | ||
| Telugu తెలుగు | ||
| Thai ไทย | ||
| Triqui Nánj nï'ïn | ||
| Tsonga Xitsonga | ||
| Tswana Setswana | ||
| Turkish Türkçe | ||
| Ukrainian Українська | ||
| Upper Sorbian Hornjoserbsce | ||
| Urdu اُردو | ||
| Uzbek Oʻzbek tili | ||
| Venda Tshivenḓa | ||
| Venetan Vèneto | ||
| Vietnamese Tiếng Việt | ||
| Welsh Cymraeg | ||
| Wolof Wolof | ||
| Xhosa isiXhosa | ||
| Zulu isiZulu |