Is Subtitles for Language Learning (Prime Video) safe?

Medium risk

Subtitles for Language Learning stores OpenSubtitles credentials using a passphrase bundled with the extension.

When you sign in to OpenSubtitles, the extension saves your username and password in chrome.storage.sync and encrypts them with a hardcoded AES-GCM passphrase shipped in its content script. It also sends those login credentials to api.opensubtitles.com to authenticate and fetch subtitle downloads.

Part of this rating comes from analysis signals we haven't published as detailed findings yet.

subtitlesfll.comv2.0.18Chrome Web Store
45Risk
Who publishes it

subtitlesfll.com - no other listings under this identity, 5 shared hostnames

What this publisher told the store about itself, and the other listings that told it the same thing.

Publisher
subtitlesfll.com

Shared hosts - 5 hostnames

Hostnames hardcoded in this extension that few other listings call. That can mean one operator behind both, and it can equally mean a small shared vendor, so it is context rather than a conclusion. Hosts that many listings call are left out: they are services, not connections.

shabdkosh.com
Also called by 2 other listings, including Readlang
almaany.com
Also called by 4 other listings, including subtilt%C3%A9e-netflix-youtube
japandict.com
Also called by 4 other listings, including Dictionariez: Your Dictionary, Your Language, Glot Extension
opensubtitles.com
Also called by 5 other listings, including Open Subtitles
purpleculture.net
Also called by 5 other listings, including CWS: Chinese Dictionary + Pinyin Annotator

AI-generated. Findings may contain errors. Those marked Verified have been manually reviewed.

Publishers can request a review.

Where it sends data

Destinations our analysis observed Subtitles for Language Learning (Prime Video) contacting. Sending data somewhere is not a finding on its own - an extension that syncs your settings has to talk to its own server - but it is where your data can go, and who else it goes to.

  • api.opensubtitles.com

    Subtitles for Language Learning (Prime Video) sends data to api.opensubtitles.com. 2 other extensions we have analysed send data here.

Updated 30 September 2026hlofmmmlhfelbfhcpapoackkglljfcnb