# +Sub

> Load subtitle to a HTML5 video.

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

## Overview

- **ID:** `plussub`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** stefan.breitenstein
- **Category:** photos-music-videos,other
- **Daily users:** 508
- **Weekly downloads:** 13
- **Rating:** 4.41 / 5 (17 ratings)
- **Version:** 6.5.6
- **Last updated:** 2024-01-16
- **First published:** 2018-11-15
- **Size:** 760 KB
- **Data as of:** 2026-09-07
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/plussub/)
- **Privacy policy:** [https://addons.mozilla.org/firefox/addon/plussub/privacy/](https://addons.mozilla.org/firefox/addon/plussub/privacy/)

## Description

**+Sub** is a powerful Chrome extension designed to enhance your video-watching experience by allowing you to load subtitles on any HTML5 video easily. Whether watching on Netflix, Amazon Video, YouTube, or embedded players in blogs, you can quickly add subtitles with just a few clicks.

The extension features a built-in subtitle search powered by TMDB and OpenSubtitles, enabling you to find your preferred subtitles in multiple languages. Alternatively, you can upload subtitle files from your local machine in popular formats such as *.srt, *.vtt, *.ass, and *.ssa. +Sub also offers synchronization capabilities, letting you adjust subtitle timing directly through an intuitive offset interface.

Beyond displaying subtitles, +Sub can show transcript text that is copyable and interactive—clicking on transcript segments jumps to corresponding video timestamps. For developers and power users, +Sub supports videos within iframes and provides open source access through its GitHub repository. Join the community on Slack for support and discussion.

## Rankings

- #4,958 — Overall
- #99 — loading
- #202 — iframe

## 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

### Pros

- Works well on platforms like Paramount Plus and provides good subtitle timing and management.
- Small set of permissions required, which enhances user privacy and security.
- Valuable tool for expats needing subtitles in various languages.

### Cons

- Struggles to function properly on Netflix, with subtitles not displaying correctly in full-screen mode.
- Frequent loading issues where the add-on does not start or show subtitles, leading to frustration.
- Inconsistent performance across different platforms, particularly with Dailymotion and others.

## Similar extensions and apps

- [Substital](https://chrome-stats.com/d/substital) — 12,821 users, 4.27 / 5
- [Open Subtitles](https://chrome-stats.com/d/opensubtitles) — 2,656 users, 3.75 / 5
- [EasySubs](https://chrome-stats.com/d/easysubs) — 189 users, 3.88 / 5
- [Add Subtitles](https://chrome-stats.com/d/add-subtitles) — 3,478 users, 4.04 / 5
- [Multi Subsitles For Youtube](https://chrome-stats.com/d/multi-subsitles-youtube) — 415 users, 3.78 / 5
- [Custom SubUploader](https://chrome-stats.com/d/custom-subuploader) — 1 users
- [Subtitle Uploader](https://chrome-stats.com/d/subtitle-uploader) — 1 users, 5.00 / 5
- [VoxSub](https://chrome-stats.com/d/voxsub) — 13 users, 5.00 / 5
- [SubText](https://chrome-stats.com/d/subtext) — 15 users, 5.00 / 5
- [YTSubtitleLoader](https://chrome-stats.com/d/ytsubtitleloader) — 27 users, 5.00 / 5
- [Display Subtitle](https://chrome-stats.com/d/displaysubtitle) — 123 users, 5.00 / 5
- [Subflix](https://chrome-stats.com/d/subflix) — 126 users, 3.14 / 5

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