Substital
Add subtitles to any video or movie online. Be it on Netflix, Disney+, Youtube or any other online streaming platform.
Substital: Add Subtitles to Online Streaming Videos
Substital is a user-friendly Firefox add-on designed to facilitate adding subtitles to various video streaming platforms. Be it Netflix, Disney+, Amazon Prime, Vimeo, Youtube, or other websites, Substital aims to bridge the language gap for entertainment, language learning, or accessibility purposes. It allows users to search for, add, and manually sync subtitles for a better viewing experience. It is completely free, without ads, and requires activation by the user when adding subtitles to a video.
Add-on stats
Manifest V3
By: Gaëtan Covelli
Rating: 4.30 
(126)
Weekly download count: 460
Firefox on Android: Yes
Permissions:
- activeTab
- storage
- scripting
Host permissions:
- <all_urls>
Size: 1.61M
Email: su*****@substital.com
URLs: Website ,Privacy policy
Full description: See detailed description
Ranking
# 770 ▲ 4
Other platforms
Not available on Android
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spammy, or outdated.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
- Easy to use
- Works perfectly for adding subtitles
- Very useful for foreign language learners
- Allows customization of subtitles
- Instant functionality with various formats
Cons
- Subtitle synchronization issues
- Progress bar doesn't advance during playback
- Limited support for certain languages or streaming platforms
Most mentioned
- Ease of use
- Subtitle synchronization problems
- Need for dual subtitles feature
- Customization options for subtitles
User reviews
by Avishek Yadav, 2025-03-03
by default-design, 2025-02-28
works perfect
by brad67676, 2025-02-25
Add-on safety
Risk impact
Substital requires a few sensitive permissions. Exercise caution before installing.
Risk impact analysis details
- Critical Allows access to all websites, posing a significant security risk as it can monitor and modify data from any visited site.
- Low ******* ****** ** *** ********* ********
Risk likelihood
We don't have sufficient data to confidently determine the risk likelihood of Substital. Use it at your own risk.
Risk likelihood analysis details
- High This extension has low user count. Unpopular extensions may not be stable or safe.
- Medium **** ********* *** ******* ** *** **** * ******* *** ******* *** *** ** ****** ** *****
- Low **** ********* *** ***** **** **** * ****** **** ***** ********** *** **** ****** ** ** ****** *** *****
- Good **** ********* *** **** **** *******
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