LangKey | YouTube Bilingual Subtitles & Language Learning — permissions and source code

Learn languages with YouTube videos! Get bilingual subtitles, sentence-by-sentence dictation, speaking scoring, and…

Users: 198
Version: 2.3.0
Updated: July 10, 2026
Size: 5.0MiB
Category: Productivity

What this extension can access

These are the capabilities LangKey | YouTube Bilingual Subtitles & Language Learning declares in its manifest. Each one is a fact about the shipped code, not a judgement about the extension.

Reaches your browsing content

declarativeNetRequest

Block or redirect requests using preset rules.

tabs

See the URL, title and favicon of every open tab.

webRequest

Observe every network request the browser makes.

Reaches browser state and activity

activeTab

Access the current tab, but only after you click the extension.

Local to the extension

offscreen

Use a hidden document for background work.

storage

Store its own settings and data locally.

Websites it can read and change

*://*.aisubtitle.hdslb.com/*

Read and change your data on *.aisubtitle.hdslb.com.

*://*.bilibili.com/*

Read and change your data on *.bilibili.com.

*://*.youtu.be/*

Read and change your data on *.youtu.be.

*://*.youtube.com/*

Read and change your data on *.youtube.com.

*://langKey.win/*

Read and change your data on langKey.win.

https://api-free.deepl.com/*

Read and change your data on api-free.deepl.com.

https://api.cognitive.microsofttranslator.com/*

Read and change your data on api.cognitive.microsofttranslator.com.

https://api.deepl.com/*

Read and change your data on api.deepl.com.

https://api.longcat.chat/*

Read and change your data on api.longcat.chat.

https://api.openai.com/*

Read and change your data on api.openai.com.

https://api.siliconflow.cn/*

Read and change your data on api.siliconflow.cn.

https://api.x.ai/*

Read and change your data on api.x.ai.

https://fanyi-api.baidu.com/*

Read and change your data on fanyi-api.baidu.com.

https://open.bigmodel.cn/*

Read and change your data on open.bigmodel.cn.

https://translate.google.com/*

Read and change your data on translate.google.com.

https://translation.googleapis.com/*

Read and change your data on translation.googleapis.com.

Pages it injects code into

*://*.127.0.0.1/**://*.bilibili.com/**://*.bilibili.com/video/**://*.langkey.win/**://*.youtu.be/**://*.youtube.com/**://*.youtube.com/embed/*

Get this extension's source code

Download the .crx package or unpack it to read the source, entirely in your browser.

Download .crx Extract source code View on Chrome Web Store

Inside the package

Manifest version	MV3
Files	84
Unpacked size	15.1 MiB
Download size	5 MiB

File types

json · 48mp3 · 11js · 8png · 7css · 4wav · 3html · 2wasm · 1

Code characteristics

Contains dynamic code evaluation (eval or new Function)
Content Security Policy: script-src 'self' 'wasm-unsafe-eval'; object-src 'self'

Domains referenced in the code

Hostnames that appear in this extension's files. A hostname here means the string is present in the code, not that data is necessarily sent to it.

api-free.deepl.comapi.bilibili.comapi.cognitive.microsofttranslator.comapi.deepl.comapi.longcat.chatapi.openai.comapi.siliconflow.cnapi.x.aicdn.jsdelivr.netfanyi-api.baidu.comopen.bigmodel.cntranslate.google.comtranslation.googleapis.comwww.youtube.com