# Open Subtitles

> Add subtitles to any HTML5 video sites such as Youtube, Netflix, Amazon Prime Video, Disney+, HBO Max and other stream sites.

Canonical page: [https://chrome-stats.com/d/opensubtitles](https://chrome-stats.com/d/opensubtitles)

## Overview

- **ID:** `opensubtitles`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** stefan.breitenstein
- **Category:** appearance,language-support,other
- **Daily users:** 2,651
- **Weekly downloads:** 118
- **Rating:** 3.75 / 5 (16 ratings)
- **Version:** 6.3.8
- **Last updated:** 2023-10-02
- **First published:** 2022-05-18
- **Size:** 642 KB
- **Data as of:** 2026-09-08
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/opensubtitles/)
- **Website:** [https://github.com/plussub/opensubtitles-extension/issues](https://github.com/plussub/opensubtitles-extension/issues)

## Description

Open Subtitles is a powerful Chrome extension designed to enrich your viewing experience across popular HTML5 video streaming platforms like YouTube, Netflix, Amazon Prime Video, Disney+, HBO Max, and many more. It automatically detects video titles and fetches matching subtitles from OpenSubtitles.com, enabling seamless subtitle integration on your favorite streaming sites.

Key features include support for multiple subtitle formats (*.srt, *.vtt, *.ass, *.ssa), drag-and-drop custom subtitle files, subtitle synchronization, and full customization of subtitle appearance including color, background, transparency, and font size. The extension also works on embedded iframes, allows transcription and text copying, and supports quick navigation through timestamps. Simply install and pin the extension, open a video, and enjoy enhanced subtitle functionality with just a click.

## Rankings

- #1,830 — Overall
- #75 — Language Support
- #285 — Other extensions
- #293 — Appearance
- #8 — openvpn
- #10 — openclaw

## Permissions and access

### Permissions

- `activeTab`
- `storage`
- `https://*.plus-sub.com/*`
- `https://gqlos.plus-sub.com/*`
- `https://*.opensubtitles.org/**/*`
- `https://*.opensubtitles.com/**/*`
- `webRequest`

## Safety

- **Risk impact:** Moderate risk impact
- **Risk likelihood:** Low risk likelihood

### Analysis details

- Allows the extension to observe and analyze traffic in flight for the selected hosts.
- This extension has low user count. Unpopular extensions may not be stable or safe.

> Some risk analysis details are omitted from this free response. [Upgrade to view the full analysis](https://chrome-stats.com/pricing).

## Review summary

Users praise Open Subtitles for effectively adding subtitles to videos lacking them, especially on ad-free streaming sites like bilibili, offering useful features and ease of use. Common issues include subtitle desynchronization caused by ads interrupting videos, lack of robust subtitle timing offset adjustments, and overlapping text when font sizes are increased. Some sources may not work with the add-on. Overall, it is valued for its core functionality but struggles with timing sync where ads disrupt playback.

### Pros

- Works well for streaming videos without ads, especially on sites like bilibili.
- Allows playing local subtitle files over remote videos, enabling subtitles where none exist.
- Simple and effective for movies missing subtitles.
- Works perfectly with many useful features.
- Helps users watch videos with missing subtitles by combining video and subtitles from different sources.

### Cons

- Subtitles get out of sync when videos have ads because the add-on does not adjust subtitle timing for ads.
- No built-in way to adjust subtitle offset time (only minor adjustment available) to fix sync issues.
- When subtitle font size is increased, two-line subtitles may overlap, reducing readability.
- Doesn't work on certain sources/websites, possibly due to compatibility issues.

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Source: [Chrome-Stats](https://chrome-stats.com/d/opensubtitles)