Inventory of dictionaries shipping in Firefox Desktop

41 locales include a dictionary in their native language

Code Language Dictionary Version Status Last check License Source Nightly-only locale
ach Acholi  
af Afrikaans  
an Aragonese  
ar Arabic Yes 3.7 2025: Added May 2026 GPL-2.0 / LGPL-2.1 / MPL-1.1 github.com  
ast Asturian 4.4.5 Investigation in progress May 2026 GPL-3.0 addons.mozilla.org  
az Azerbaijani  
be Belarusian  
bg Bulgarian Yes 4.4.5 2026: Updated May 2026 GPL-2.0 / LGPL-2.1 / MPL-1.1 sourceforge.net  
bn Bengali Incompatible license May 2026 GPL-2.0 addons.mozilla.org  
bo Tibetan Yes 0.4.0 2026: Added May 2026 CC0 github.com Nightly-only locale
bqi Luri Bakhtiari Nightly-only locale
br Breton Yes 0.14 Up to date May 2026 GPL-2.0 / LGPL-2.1 / MPL-1.1 drouizig.org  
brx Bodo Nightly-only locale
bs Bosnian  
ca Catalan Yes 3.0.9 2025: Updated May 2026 GPL-2.0 / LGPL-2.1 github.com  
ca-valencia Catalan (Valencian) Yes 3.0.9 2025: Added May 2026 GPL-2.0 / LGPL-2.1 github.com  
cak Kaqchikel  
ckb Central Kurdish Nightly-only locale
cs Czech No dictionary found May 2026 CC0 gitlab.com  
cy Welsh Yes 25.03 2026: Added May 2026 LGPL-3.0 github.com  
da Danish Yes 2.9.097 2026: Updated May 2026 GPL-2.0 / LGPL-2.1 / MPL-1.1 stavekontrolden.dk  
de German  
dsb Lower Sorbian  
el Greek Yes 0.9 2025: Updated May 2026 GPL-2.0 / LGPL-2.1 / MPL-1.1 addons.mozilla.org  
en-CA English (Canada) Yes 2020.12.07 Up to date May 2026 BSD wordlist.aspell.net  
en-GB English (UK) Yes 2026.05.01 2026: Added May 2026 LGPL-3 github.com  
eo Esperanto  
es-AR Spanish (Argentina) Yes 2.9 2025: Updated May 2026 GPL-3.0 / LGPL-3.0 / MPL-1.1 github.com  
es-CL Spanish (Chile) Yes 2.9 2025: Updated May 2026 GPL-3.0 / LGPL-3.0 / MPL-1.1 github.com  
es-ES Spanish (Spain) Yes 2.9 2025: Updated May 2026 GPL-3.0 / LGPL-3.0 / MPL-1.1 github.com  
es-MX Spanish (Mexico) Yes 2.9 2025: Updated May 2026 GPL-3.0 / LGPL-3.0 / MPL-1.1 github.com  
et Estonian Yes 1.0 Up to date May 2026 LGPL-2.1 extensions.services.openoffice.org  
eu Basque  
fa Persian Yes 3.3 2026: Added May 2026 Apache-2.0 github.com  
ff Fulah  
fi Finnish 0.2 2026: Candidate May 2026 CC0 github.com  
fr French Yes 7.7 2026: Updated May 2026 MPL-2.0 grammalecte.net  
fur Friulian  
fy-NL Frisian Yes 20160722 2025: Updated May 2026 Apache 2.0 www.fryslan.frl  
ga-IE Irish  
gd Scottish Gaelic  
gl Galician  
gn Guarani  
gu-IN Gujarati  
he Hebrew  
hi-IN Hindi Incompatible license May 2026 GPL-3.0 github.com  
hr Croatian Yes v2.1-20251229 2026: Added May 2026 LGPL-2.1 github.com  
hsb Upper Sorbian  
hu Hungarian Yes 1.9.1 2026: Updated May 2026 MPL-2.0 / LGPL-3.0 github.com  
hy-AM Armenian 3.0.1 2026: Candidate May 2026 MIT github.com  
hye Easter Armenian Nightly-only locale
ia Interlingua  
id Indonesian Yes 2.3.0 2026: Updated May 2026 MPL-2.0 / LGPL-3.0 github.com  
is Icelandic  
it Italian Incompatible license May 2026 GPL-2.0 sourceforge.net  
ja Japanese 2020.12.07 English dictionary May 2026 BSD wordlist.aspell.net  
ka Georgian Yes 0.1 2026: Added May 2026 MIT github.com  
kab Kabyle Investigation in progress May 2026 MIT? addons.mozilla.org  
kk Kazakh  
km Khmer Incompatible license May 2026 No licence addons.mozilla.org  
kn Kannada  
ko Korean Incompatible license May 2026 GPL-3.0 github.com  
ku Kurdish 0.96 Unknown source May 2026 GPL-2.0 / LGPL-2.1 / MPL-1.1 addons.mozilla.org Nightly-only locale
lij Ligurian  
lo Lao Nightly-only locale
lt Lithuanian Yes 1.3.2 Up to date May 2026 BSD github.com  
ltg Latgalian Nightly-only locale
lv Latvian Yes 1.5.0 2026: Updated May 2026 LGPL-2.1 dict.dv.lv  
meh Southwestern Tlaxiaco Mixtec Nightly-only locale
mk Macedonian 2025: Removed May 2025 wiki.mozilla.org  
ml Malayalam Nightly-only locale
mr Marathi Incompatible license May 2026 github.com  
ms Malay  
my Burmese  
nb-NO Norwegian Bokmål Incompatible license May 2026 GPL github.com  
ne-NP Nepali  
nl Dutch Yes 2.20.19 Up to date May 2026 BSD github.com  
nn-NO Norwegian Nynorsk Incompatible license May 2026 GPL github.com  
oc Occitan Incompatible license May 2026 Closed source dicodoc.eu  
pa-IN Punjabi  
pl Polish Yes 2026-05-11 2026: Updated May 2026 GPL-2.0 / LGPL-2.1 / MPL-1.1 sjp.pl  
pt-BR Portuguese (Brasil) Yes 140.2025.142.1267 2025: Updated May 2026 GPL-2.0 / LGPL-2.1 / MPL-1.1 addons.mozilla.org  
pt-PT Portuguese Yes 20.10.5.1 Up to date May 2026 GPL-2.0 / LGPL-2.1 / MPL-1.1  
rm Romansh Yes 2.2.1-260527.032231 2026: Updated Jun 2026 MIT github.com  
ro Romanian Yes 3.3.10 Up to date May 2026 GPL-2.0 / LGPL-2.1 / MPL-1.1 sourceforge.net  
ru Russian Yes 1.2 2026: Outdated May 2025 Custom, see source bugzilla.mozilla.org  
sat Santali  
sc Sardinian  
scn Sicilian Nightly-only locale
sco Scots  
si Sinhala  
sk Slovak Yes 2.03-0, 2009-12-05 Up to date May 2026 GPL-2.0 / LGPL-2.1 / MPL-1.1 spell.linux.sk  
skr Saraiki  
sl Slovenian Yes 2025.01.02 2026: Added May 2026 GPL-2.0 / LGPL-2.1 spell.linux.sk  
son Songhay  
sq Albanian  
sr Serbian Yes 2010-08-18 Unknown source May 2026 GPL-2.0 / LGPL-2.1 / MPL-1.1  
sv-SE Swedish Yes de721f0f 2026: Updated May 2026 LGPL-3.0 github.com  
szl Silesian  
ta Tamil Yes 0.4 2026: Added May 2026 MPL-1.1 addons.mozilla.org  
te Telugu  
tg Tajik Yes 1.0.0 2026: Added May 2026 MIT github.com  
th Thai  
tl Tagalog  
tr Turkish Yes 2.1.0 2026: Added May 2026 MPL-2.0 github.com  
trs Triqui No dictionary found May 2026  
uk Ukrainian Yes 6.8.0 2026: Updated May 2026 GPL-3.0 / LGPL-2.1 / MPL-1.1 github.com  
ur Urdu 6.8.0 Incompatible license May 2026 Unclear if MPL, GPL or LGPL. addons.mozilla.org  
uz Uzbek Incompatible license May 2026 GPL-2.0 addons.mozilla.org  
vi Vietnamese 2024: Removed May 2026 GPL-3 github.com  
wo Wolof No dictionary found May 2026 Nightly-only locale
xh Xhosa Yes 20110323.3 2026: Added May 2026 LGPL-2.1 addons.mozilla.org  
zh-CN Chinese (Simplified) No dictionary found May 2026  
zh-TW Chinese (Traditional) 2020.12.07 English dictionary May 2026 BSD wordlist.aspell.net