Firefox Browser Add-ons
  • Extensions
  • Themes
    • for Firefox
    • Dictionaries & Language Packs
    • Other Browser Sites
    • Add-ons for Android
Log in
Preview of vCaptions – Video Caption List

vCaptions – Video Caption List by vCaptions

Add smart captions lists to any website video. Supports YouTube and Bilibili with translation, chapters and AI summaries.

0 (0 reviews)0 (0 reviews)
3 Users3 Users
Download Firefox and get the extension
Download file

Extension Metadata

About this extension
vCaptions is the ultimate AI video assistant and subtitle translator. It transforms how you watch online videos by generating interactive transcripts, providing AI-powered summaries, and enabling dual-language subtitles for effective learning.

Whether you are a researcher, a student learning a new language, or just want to save time, vCaptions helps you digest video content 10x faster on YouTube, Bilibili, and any website with HTML5 video.

⭐ Key Features
- Interactive Video Transcript: View the full subtitle list alongside playback. Click any caption line to instantly jump to that specific timestamp.
- AI Summary & Chat (ChatGPT powered): Don't have time to watch the whole video? Get instant video summaries, key takeaways, and ask the AI questions about the content directly.
- Dual Subtitles & Translation: Break language barriers with real-time subtitle translation. Enable dual captions (native + translated) for seamless language learning and comparison.
- Smart Chapter Extraction: Automatically detect topics and generate video chapters for easy navigation, even if the creator didn't add them.
- Subtitle Downloader: Easily copy captions to your clipboard or export subtitles as .SRT, .VTT, or .TXT files for offline use.
- Flexible Layouts: Choose your preferred viewing mode — Sidebar, Floating Window (Picture-in-Picture style), or Embedded mode. The floating panel is fully resizable and draggable.
- Customizable UI: Full Dark Mode support and font size adjustments for comfortable reading.

🎯 Optimized for Major Platforms
- YouTube: Best-in-class support for YouTube videos, embedded players.
- Bilibili: Optimized experience for Bilibili videos.

🚀 Use Cases
- For Language Learners: Watch videos with bilingual subtitles to improve listening and vocabulary.
- For Content Creators: Quickly download transcripts to repurpose video content into blog posts.
- For Professionals: Use AI summarization to quickly grasp the main points of long webinars or tutorials.

❓ FAQ
Q: Can I download YouTube subtitles with this extension?
A: Yes! You can export captions in .srt or .vtt formats with one click.

Q: Does it support translation?
A: Yes, vCaptions provides translation to convert subtitles into your preferred language.
Rated 0 by 0 reviewers
Log in to rate this extension
There are no ratings yet

Star rating saved

5
0
4
0
3
0
2
0
1
0
No reviews yet
Permissions and data

Required permissions:

  • Access browser tabs
  • Access your data for all websites

Required data collection, according to the developer:

  • Personally identifying information
  • Website activity
Learn more
More information
Add-on Links
  • Support site
  • Support Email
  • Copy add-on ID
Version
2.4.1
Size
7.82 MB
Last updated
2 months ago (Mar 15, 2026)
Related Categories
  • Other
License
All Rights Reserved
Version History
  • See all versions
Add to collection
Report this add-on
Go to Mozilla's homepage

Add-ons

  • About
  • Firefox Add-ons Blog
  • Extension Workshop
  • Developer Hub
  • Developer Policies
  • Community Blog
  • Forum
  • Report a bug
  • Review Guide

Browsers

  • Desktop
  • Mobile
  • Enterprise

Products

  • Browsers
  • VPN
  • Relay
  • Monitor
  • Pocket
  • Bluesky (@firefox.com)
  • Instagram (Firefox)
  • YouTube (firefoxchannel)
  • Privacy
  • Cookies
  • Legal

Except where otherwise noted, content on this site is licensed under the Creative Commons Attribution Share-Alike License v3.0 or any later version.