Language learning Firefox add-ons

Apps and tools for learning a language: courses, vocabulary, flashcards, exams. 606 live add-ons carry the topic.

Tags come from each listing's name, category and description, read in English: a listing written in another language is tagged only where it uses the English words.

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  1. Yomitan↗

    by Darius Jahandarie · updated 2026-09-18

    Powerful and versatile pop-up dictionary for language learning used by 100,000+ language learners.

    Appearance ★ Featured v26.9.8.0
    Daily users 50,992 +972 wk
    Rating 4.8 124 ratings
    Growth · week +2.0% weekly avg over 14 days

  2. Language Reactor sacrosanctx↗

    by colonelmd · updated 2025-09-17

    Learn languages effectively by watching films and series in your target language.

    Language Support v5.1.4
    Daily users 5,584 +67 wk
    Rating 4.0 19 ratings
    Growth · week +1.2% weekly avg over 14 days

  3. Duolingo Max↗

    by apersongithub · updated 2026-04-17

    Gives Duolingo Max features for free

    Appearance v3.6
    Daily users 1,609 +19 wk
    Rating 5.0 28 ratings
    Growth · week +1.2% weekly avg over 14 days

  4. Dual Subtitles & AI Translation - InterSub↗

    by InterSub · updated 2026-09-24

    Language learning with dual subtitle translator dualsub to immersive translate meaning of words: Spanish to English, to Japanese etc

    Appearance v4.51.1
    Daily users 1,517 +14 wk
    Rating 3.9 20 ratings
    Growth · week +0.9% weekly avg over 14 days

  5. asbplayer (Official)↗

    by asbplayer · updated 2026-10-14

    Enhance streaming video for language-learning.

    Other v1.22.0
    Daily users 2,468 +21 wk
    Rating 4.8 10 ratings
    Growth · week +0.9% weekly avg over 10 days

  6. S3.Translator↗

    by Oleksandr · updated 2025-02-27

    S3.Translator adds the power of Google Translate’s automatic translations to your browser! It supports translation of selected text, entered phrase or whole webpage between any of 100+ languages. New

    Language Support v6.30
    Daily users 16,184 +1 wk
    Rating 4.7 318 ratings
    Growth · week +0.0% weekly avg over 14 days

  7. LingQ Importer↗

    by LingQ · updated 2026-08-16

    Automatically import foreign language pages, videos, movies from the web & study them with LingQ's web & mobile language learning apps.

    Language Support v2.3.52
    Daily users 6,622 -12 wk
    Rating 4.0 21 ratings
    Growth · week -0.2% weekly avg over 14 days

  8. Reverso – Translation, dictionary↗

    by Reverso.net · updated 2022-03-23

    Translate and learn languages while browsing and watching movies, it’s free.

    Language Support v2.2.205
    Daily users 10,139 -46 wk
    Rating 4.2 320 ratings
    Growth · week -0.4% weekly avg over 14 days

  9. ASBPlayer: Learn with Subs↗

    by MirSolUu · updated 2025-04-01

    Language learning subtitle player for streaming platforms like Netflix, YouTube, and more.

    Web Development v1.9.1
    Daily users 2,344 -13 wk
    Rating 4.3 6 ratings
    Growth · week -0.6% weekly avg over 10 days