Dualsub - Dual Subtitles for YouTube

Display dual subtitles.

Dualsub - View Dual Subtitles on YouTube

Dualsub - Dual Subtitles for YouTube is a powerful Firefox add-on that enables users to view dual subtitles on YouTube and over 10 other video websites. It supports both desktop and mobile browsers, enhancing accessibility and understanding of video content. Perfect for language learners or anyone wanting to grasp dialogues in two languages simultaneously!

Add-on stats

Daily users: 4,680
-146
Version: 2.57.6 (Last updated: 2025-02-05)
Creation date: 2018-10-03
Weekly download count: 105
Firefox on Android: Yes
Risk impact: High risk impact
Risk likelihood:
Manifest version: 3
Permissions:
  • storage
Host permissions:
  • https://api.dualsub.xyz/*
Size: 36.90K
URLs: Website

Other platforms

Dualsub - Dual Subtitles for YouTube (v2.57.5)
3.65 (433) 100,000
Not available on Android
Dualsub - Dual Subtitles for YouTube (v2.57.5)
4.20 (40) 34,702
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Add-on summary

Use Dualsub to display dual subtitles on YouTube.

Feature Description

Supported browsers:

  • Supports desktop browsers: Chrome, Edge, Firefox.
  • Supports mobile browsers: Firefox (Android), Orion (iOS).

Supported video websites:

  • Supports YouTube, including mobile version.
  • Supports Bilibili, Coursera, and Udemy, totaling over 10 video websites.

For more information, please visit <https://www.dualsub.xyz/>.

User reviews

These summaries are automatically generated weekly using AI based on recent user reviews. Firefox Browser Add-ons does not verify user reviews, so some user reviews may be inaccurate, spammy, or outdated.
Pros
  • Useful for learning languages
  • Automatically adds subtitles to videos
  • Works well with mobile YouTube
  • Remembers language settings between videos
  • Available for multiple languages
Cons
  • The latest update broke some functionality like toggling subtitle visibility
  • Issues with native subtitles not working
  • Problems with server response errors for certain translations
  • Manual language setting required when changing videos
  • Confusion between different modes causing overlap issues
Most mentioned
  • Recent update broke key functionalities
  • Great for learning and translating languages
  • Need for automatic subtitle detection and display
  • Problems with specific language translations (e.g., Russian)
  • Desire for better user instructions or tutorials
User reviews


The latest update has ruined this extension. You can no longer switch styles from the settings and there is no way to toggle the visibility of the subs now. It used to be as simple as turning off captions off, now you have to disable the extension to do this. Used to be my favorite tool. Alas.
by Prince, 2025-01-16
View all user reviews

Add-on safety

Risk impact

Dualsub - Dual Subtitles for YouTube requires some sensitive permissions that could impact your browser and data security. Exercise caution before installing.

Risk impact analysis details
  • Critical Request access to the following domains: youtube.com, ardmediathek.de, bilibili.com, coursera.org, iflix.com, iq.com, udemy.com, viki.com, youku.tv, zdf.de, wetv.vip, dualsub.xyz
  • High ******* ******* **** *** ****** ***** *** ***** ** ******* **** ********* ********* ** * *********** *****
Risk likelihood

Dualsub - Dual Subtitles for YouTube is probably trust-worthy. Prefer other publishers if available. Exercise caution when installing this add-on.

Risk likelihood analysis details
  • High This extension was recently updated in the past month. New updates may not be stable or safe.
  • High **** ********* *** *** **** ****** ********* ********** *** *** ** ****** ** *****
  • Low **** ********* *** ***** **** **** * ****** **** ***** ********** *** **** ****** ** ** ****** *** *****
  • Good **** ********* *** **** **** *******
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