# LexiSpark: Science-Backed Video Learning

> Learn languages from YouTube & HDrezka videos with dual subtitles, word translation, and FSRS spaced repetition.

Canonical page: [https://chrome-stats.com/d/lexispark](https://chrome-stats.com/d/lexispark)

## Overview

- **ID:** `lexispark`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** Rnbsov
- **Category:** language-support,photos-music-videos
- **Daily users:** 1
- **Weekly downloads:** 1
- **Version:** 0.1.2
- **Last updated:** 2026-05-15
- **First published:** 2026-05-09
- **Size:** 1.42 MB
- **Data as of:** 2026-09-07
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/lexispark/)
- **Website:** [https://t.me/LexiSpark\_Contact](https://t.me/LexiSpark_Contact)
- **Privacy policy:** [https://addons.mozilla.org/firefox/addon/lexispark/privacy/](https://addons.mozilla.org/firefox/addon/lexispark/privacy/)

## Description

<strong>LexiSpark</strong> is a science-backed language learning tool that turns your favorite videos into interactive lessons. Seamlessly integrate dual subtitles and instant word translations into YouTube, Netflix, Coursera, and HDrezka.

Key Features:
 Smart Overlays: Interactive subtitle translation on top streaming platforms.
    FSRS Spaced Repetition: Save new vocabulary and learn it efficiently using scientifically proven memory algorithms.
    Contextual Learning: Learn words as they are used in real movies and lectures

## Rankings

- #118,906 — Overall
- #172 — learn

## Permissions and access

### Permissions

- `storage`
- `unlimitedStorage`
- `activeTab`
- `cookies`
- `windows`
- `declarativeNetRequest`

### Host permissions

- `*://*.youtube.com/*`
- `*://*.hdrezka.ag/*`
- `*://*.hdrezka.me/*`
- `*://*.hdrezka.co/*`
- `*://*.hdrezka.cm/*`
- `*://*.hdrezka.kim/*`
- `*://*.hdrezka.sh/*`
- `*://*.rezka.ag/*`
- `*://*.rezkify.com/*`
- `*://*.rezkery.com/*`
- `*://*.coursera.org/*`
- `*://*.netflix.com/*`
- `http://localhost:3000/*`
- `https://*.lexispark.app/*`
- `https://lexispark.app/*`
- `https://api.lexispark.app/*`
- `https://api.mymemory.translated.net/*`
- `*://*.crunchyroll.com/*`
- `*://*.jut.su/*`
- `*://*.hianime.to/*`
- `*://*.hianime.sk/*`
- `*://*.hianimez.to/*`
- `*://*.hianimetv.cfd/*`
- `*://*.aniwatch.to/*`
- `*://*.9anime.to/*`
- `*://*.9animetv.to/*`
- `*://*.aniwave.ru/*`
- `*://*.aniwaves.ru/*`
- `*://*.aniwave.to/*`
- `*://*.megacloud.tv/*`
- `*://*.megacloud.blog/*`
- `*://*.megacloud.club/*`
- `*://*.megaplay.buzz/*`
- `*://*.dokicloud.one/*`
- `*://*.rapid-cloud.co/*`
- `*://*.anix.pm/*`
- `*://*.lostproject.club/*`
- `*://*.lostproject.one/*`
- `*://*.echovideo.ru/*`
- `*://*.echovideo.to/*`
- `*://*.2cdns.com/*`
- `*://*.weneverbeenfree.com/*`
- `*://*.lostproject.one/*`

### Content script matches

- `*.coursera.org`
- `*.crunchyroll.com`
- `*.hdrezka.ag`
- `*.hdrezka.cm`
- `*.hdrezka.co`
- `*.hdrezka.kim`
- `*.hdrezka.me`
- `*.hdrezka.sh`
- `*.rezka.ag`
- `*.rezkery.com`
- `*.rezkify.com`
- `*.anix.pm`
- `*.dokicloud.one`
- `*.echovideo.ru`
- `*.echovideo.to`
- `*.megacloud.blog`
- `*.megacloud.club`
- `*.megacloud.tv`
- `*.megaplay.buzz`
- `*.rapid-cloud.co`
- `*.weneverbeenfree.com`
- `*.9anime.to`
- `*.9animetv.to`
- `*.aniwatch.to`
- `*.aniwave.ru`
- `*.aniwave.to`
- `*.aniwaves.ru`
- `*.hianime.sk`
- `*.hianime.to`
- `*.hianimetv.cfd`
- `*.hianimez.to`
- `*.jut.su`
- `*.netflix.com`
- `localhost`
- `*.youtube.com`

## Safety

- **Risk impact:** High risk impact
- **Risk likelihood:** High risk likelihood

### Analysis details

- Request access to the following domains: coursera.org, crunchyroll.com, hdrezka.ag, hdrezka.cm, hdrezka.co, hdrezka.kim, hdrezka.me, hdrezka.sh, rezka.ag, rezkery.com, rezkify.com, anix.pm, dokicloud.one, echovideo.ru, echovideo.to, megacloud.blog, megacloud.club, megacloud.tv, megaplay.buzz, rapid-cloud.co, weneverbeenfree.com, 9anime.to, 9animetv.to, aniwatch.to, aniwave.ru, aniwave.to, aniwaves.ru, hianime.sk, hianime.to, hianimetv.cfd, hianimez.to, jut.su, netflix.com, localhost, youtube.com, lexispark.app, translated.net, lostproject.club, lostproject.one, 2cdns.com
- This extension has low user count. Unpopular extensions may not be stable or safe.

> Some risk analysis details are omitted from this free response. [Upgrade to view the full analysis](https://chrome-stats.com/pricing).

## Similar extensions and apps

- [FlexiLingo – Video & Podcast Learning](https://chrome-stats.com/d/flexilingo-lang-learning) — 4 users
- [Lexiora - AI dictionary & vocabulary builder](https://chrome-stats.com/d/lexiora) — 5 users
- [Lexios](https://chrome-stats.com/d/lexios) — 20 users, 5.00 / 5
- [PrimeVocab - Dual Subtitle & Spaced Repetition Voc](https://chrome-stats.com/d/primevocab-dual-subtitle) — 8 users
- [Lenguia - Language Learning](https://chrome-stats.com/d/lenguia-language-learning) — 12 users
- [FlixSubs](https://chrome-stats.com/d/flixsub) — 19 users
- [EasySubs](https://chrome-stats.com/d/easysubs) — 189 users, 3.88 / 5
- [Lokia - Dual Subtitles & Language Learning](https://chrome-stats.com/d/lokia) — 5 users, 5.00 / 5
- [LexiDrop: AI Language Assistant & Translator](https://chrome-stats.com/d/lexidrop) — 1 users
- [FluentAI: Dual Subtitles for Netflix & more](https://chrome-stats.com/d/fluentai-language-learning) — 37 users, 3.00 / 5
- [FluentAI: Dual Subtitles for Netflix & more](https://chrome-stats.com/d/fluentai-app) — 232 users, 3.58 / 5
- [SubText](https://chrome-stats.com/d/subtext) — 15 users, 5.00 / 5

---

Source: [Chrome-Stats](https://chrome-stats.com/d/lexispark)