No malware found
In code review (v2024.152)
Our reviewer read version 2024.152 — the most recent version we have reviewed — and found no malicious behaviour. The version shown here has not been individually reviewed yet.
What our analysis found
FluentAI: Dual Subtitles for Netflix & more, used by 9,000 people, showed no malicious code in Extension Auditor's review. Our code review reported 1 finding (1 medium), led by network interception. It comes from a trusted publisher and was last updated in October 2026.
Key findings
- Medium
Network Interception
The extension installs dynamic declarativeNetRequest rules that spoof the Origin header (to '[domain withheld]') and both Origin and Referer headers (to '[domain withheld]' / '[domain withheld]') on all XMLHttpRequests matching those domains. This bypasses the CORS-based access controls these services use to restrict their web APIs to browser sessions originating from their own pages. The technique allows the extension to consume DeepL's and [domain withheld]'s translation APIs without authorization, constituting third-party API ToS abuse. It does not intercept or exfiltrate user data.
Analyst notes
The extension is a legitimate language-learning tool: all API traffic flows to the publisher's own backend ([domain withheld] on [domain withheld]), the publisher holds a Google Trusted Publisher badge and a Featured listing with 1,076-day history, and the ML score is 0.00. The one substantive technical issue is in (lines 1500–1541), where declarativeNetRequest dynamic rules spoof the Origin and Referer headers on XHR requests to [domain withheld] and [domain withheld], enabling unauthorized use of those third-party translation APIs — API ToS abuse against but not user-hostile. The third-party risk score (impact, likelihood) and publisher reputation (low, Google-trusted) both corroborate a false-positive interpretation.
FluentAI: Dual Subtitles for Netflix & more Chrome extension security report
ID: hbghjfaenddmdpbkobgdcgkmcdcdjjko
Supported Languages
Extension Info & Metadata
Publisher Contextual Analysis
- Author
- https://fluentai.pro
- Privacy
- Privacy Policy
- Help
- Help Center
- MX records exist
- Yes
- Domain exists
- Yes
- Is disposable
- No
- Is role-based
- No
- Mailbox exists
- Yes
- Website
- Visit
Email Change History
Screenshots & videos
Install growth
No Security Analysis Available
Security analysis has not been performed for this extension version yet.
About this extension
Discover the best way to learn a new language while watching your favorite movies and series on Netflix, YouTube, and Disney+.
Read the publisher’s full description
FluentAI – AI-Powered Dual-Subtitle Language Learning Extension FluentAI turns movies and videos into interactive language lessons. It overlays dual subtitles (original + translation) on Netflix, YouTube, Disney+, and other platforms, so you read and learn simultaneously. Every word is clickable: instant translations, definitions, example sentences, and grammar analysis appear in a popup just like a built-in dictionary. This immersive approach follows the trend of other tools (e.g., Language Reactor, Lingopie) that emphasize “Netflix dual subtitles” and interactive vocabulary. FluentAI goes further by using AI to support all languages (no hard-coded list) and syncing subtitles precisely with the audio. Key Features: * Dual Bilingual Subtitles: Works on Netflix, YouTube, Disney+, HBO Max, etc., showing original and translated subtitles together. Instantly look up any subtitle word (click or tap) to get translations, pronunciation, and usage examples. * AI-Powered Translation & Grammar: Unlike simple subtitle-only tools, FluentAI uses AI to translate any language and analyze grammar. Clicking a word also reveals grammar notes and contextual explanations (similar to Lingopie’s AI grammar feature). Sentence breakdowns and AI grammar help make even complex lines easy to understand. * Integrated Vocabulary Notebook & Flashcards: Save words or entire phrases with one click. FluentAI automatically creates smart flashcards (with audio and example sentences) and lets you export them (e.g., to Anki). A built-in notebook organizes saved words with filters and tracks which words you’ve learned (feature-comparable to Migaku’s flashcard system). * Custom Playback Modes: Learning modes like Pause Mode (auto-pause on new words), Voice-Repeat Mode (listen and repeat with AI voice), and Resume Mode help match the video to your study pace. There’s even speed-control and looping to focus on tricky phrases. * Customizable Subtitle Display: Adjust subtitle font, color, size, position, opacity, and background blur. Support for lifelike text-to-speech means FluentAI can read any subtitle out loud in a natural voice – handy for pronunciation practice. * Full-Length, Multi-Language Support: Thanks to AI, FluentAI works on full movies or series in any language, without pre-built subtitle sets. Whether it’s Spanish telenovelas or Korean dramas, FluentAI generates dual subtitles on-the-fly. (Competitor tools like Trancy support many sites and languages, and FluentAI matches that flexibility.) * Progress Tracking & Statistics: FluentAI keeps statistics on your learning – how many words you’ve saved, practiced, or mastered. Use these analytics to see your improvement over time (a feature missing in basic subtitle extensions). Comparison with Other Extensions: FluentAI includes all the core tools of the popular language-learning players and adds extra AI enhancements: * Language Reactor (a.k.a. “Language Learning with Netflix”): Offers dual subtitles on Netflix plus a popup dictionary. FluentAI matches these (covering Netflix and much more) and adds AI-synced subtitles and interactive word analysis on YouTube, Disney+, etc. * Lingopie: Provides smooth bilingual subtitles and clickable word lookups with AI grammar help. FluentAI offers the same instant translation and grammar insights on subtitles, but extends them to all streaming/video sites and languages. * Migaku: Known for its powerful flashcard creation and tracking. FluentAI likewise lets you create flashcards from any video subtitle and export decks (e.g., to Anki), while also providing more playback-learning modes. * Trancy: Supports bilingual subs on YouTube/Netflix and has AI text translation for web content. FluentAI’s focus is on video, but it also handles any site text. On videos, FluentAI provides similar bilingual subtitles plus advanced modes (pause, voice-repeat) not found in Trancy. By combining these features, FluentAI becomes a one-stop solution: Netflix dual subtitles, YouTube dual subtitles, plus interactive word definitions, grammar breakdowns, example sentences, and smart flashcard tools – all in one extension. Try, you’ll like it.
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