Understand a show, one line at a time.
A Chrome extension for learning English and Japanese line by line on Netflix and YouTube. Replay what you missed, ask about what you didn’t get, and keep the lines you love together with the scene they came from.
Downloadsubtitle-study-v0.2.7.zip · 55 KB- Chrome extension
- Netflix · YouTube
- English · Japanese
- Data stays on your device
Three moves
- 01
Hear it
Pause automatically after every line and loop one line until it lands. Hide the text to listen first, then click the subtitle to peek. Works in full screen.
QRH - 02
Get it
Click ⧉ next to a line to copy it with two lines of context on each side and a study prompt, then paste into Gemini in Chrome for a plain explanation, tone and examples. The extension itself talks to no AI.
⧉⌘C - 03
Keep it
Saving a line keeps the title, timestamp and context with it. Replay today’s lines, loop ~5-minute segments around them, or shuffle them for a blind listening test.
E
Shortcuts
Work on the video page or the side panel’s Live tab, and only ever on the current video.
- A
- Previous line
- S
- Hear it again
- D
- Next line
- Q
- Pause per line
- R
- Loop this line
- E
- Save this line
- H
- Hide the text
While looping a segmentWBack to segment startSpacePause / resume
- 01
Download and unzip
Unzip into a folder you won’t delete or move later.
- 02
Open the extensions page
Go to chrome://extensions and switch on Developer mode (top right).
- 03
Load it
Click “Load unpacked” and pick the folder that directly contains manifest.json. Reload the video page, then click the toolbar icon to open the side panel.
Updating: unzip the new version over the old folder, press reload on the extension’s card, then reload the video page. Saved lines are kept.
Works with
- Chrome 138 or later
- Netflix: picks the original-language English / Japanese track
- YouTube: prefers human captions, then auto-generated
- Not on the Chrome Web Store yet
Your data
Saved lines, notes and review history live in your own browser (chrome.storage.local) and are never uploaded anywhere. For segment loops it stores only subtitle timings, never the dialogue itself.
Checksum
ZIP · SHA-256b73f16458b669f4f2b2b5e80205e3ba516044d2dbafbe6ad811b354734dbc31e