Dualsub - Dual Subtitles for YouTube

Name: Dualsub - Dual Subtitles for YouTube
Rating: 4.3784 (111 reviews)
Author: Dualsub Studio

Display dual subtitles on video websites.

Download

Install Compare

Dualsub is a versatile Chrome extension that allows you to display dual subtitles simultaneously on YouTube and multiple other video websites. Originally created specifically for YouTube, it now supports a full list of sites, allowing users to enjoy subtitles in two languages or formats side-by-side.

The extension uses a standalone subtitle renderer independent of the website's built-in subtitle features, ensuring seamless and uninterrupted subtitle display. It is lightweight, with a size of less than 40KB, making it efficient and simple to use without impacting browser or video performance.

Video Accessibility Productivity

By:

Daily users:

Rating:

Version:

2.60.0 Last updated: 2025-05-19

Version code:

5952192

Creation date:

2018-10-03

Risk:

Permissions:

storage

Size:

36.19K

URLs:

Website

Full description:

Source:

Firefox Browser Add-ons

Updated:

a day ago

Ranking

# 1,176 ▼ 1

Other rankings

#47 in Language Support ▲ 1

#177 in Photos, Music & Videos ▲ 1

#64 in display keyword 21 ▲ 5

#183 in website keyword 76 ▲ 10

#195 in youtube keyword 81 ▼ 2

Upgrade to see more rankings

Other platforms

Dualsub - Dual Subtitles for YouTube (v2.59.2)

100,000+ 3.63

(438)

Dualsub - Dual Subtitles for YouTube (v2.60.0)

45,574+ 4.20

(40)

User reviews

Users appreciate the add-on's effectiveness in providing dual subtitles on YouTube, benefiting language learners, and its improved memory for language settings. It works well on both desktop and mobile platforms and supports multiple languages. However, common issues include limited subtitle language support (notably Turkish), inability to customize subtitle sizes, removal of subtitle visibility toggle after updates, server response and quota errors affecting certain translations, and the need to manually reset language on mobile when switching videos.

Pros

Effectively supports dual subtitles on YouTube, aiding language learning.
Works well on both desktop and mobile YouTube platforms.
Remembers language settings in recent updates, improving usability.
Automatically adds subtitles in target languages for videos on various sites.
Supports multiple languages and is helpful for translating and learning foreign languages.

Cons

Lack of Turkish subtitle support and limited language options for subtitles.
The secondary subtitles are larger than primary subtitles with no customization option.
Recent updates removed style switching and subtitle visibility toggling from settings, reducing flexibility.
Issues with translation server response and quota limits affecting functionality, especially for Russian to English translation.
Requires manual language selection on mobile when changing videos, which some find inconvenient.

Recent reviews

There is no Turkish subtitle support. Also, when adding dual subtitles, an option can be added for one subtitle to be at the bottom of the video and the other to be at the top.

by A. M., 2025-05-16

Yüklediğim tarih iyi itibariyle güzel sorunsuz çalışıyor

by Sengonul35, 2025-04-27

It's annoying that the secondary subtitles are always bigger than the original and you can't change it, but it's the best dual subtitles addon for firefox.

by Firefox user 18177036, 2025-04-19

View all user reviews ›

Extension 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: {{requestedDomains}}
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 **** ********* *** **** **** *******

Upgrade to see full risk analysis details

Instantly check and monitor your browser extensions' risks and permissions with Extension Guard.