Who should use CaptionSubtitleTool?

CaptionSubtitleTool is a consumer product built for online video viewers who use captions or subtitles.

Is CaptionSubtitleTool free?

Yes — CaptionSubtitleTool is free to use.

What platforms does CaptionSubtitleTool run on?

CaptionSubtitleTool runs on the web, embeddable surfaces, and Android.

Is CaptionSubtitleTool still active?

Unverified. CaptionSubtitleTool has not been re-checked since it entered the index, so there is no finding either way — and only a positive finding would say otherwise.

What projects are similar to CaptionSubtitleTool?

Similar projects tracked by PulseGate include Alt Captioner, Caption Bank, and Shot Caption.

Who develops CaptionSubtitleTool?

CaptionSubtitleTool is developed by Firefox user 15314155.

When did CaptionSubtitleTool launch?

CaptionSubtitleTool first shipped in 2024.

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CaptionSubtitleTool

Name: CaptionSubtitleTool
Author: Firefox user 15314155

mozilla.orgSubtitles & captions

CaptionSubtitleTool is a Firefox browser extension that provides caption and subtitle functions for online videos, including YouTube. It is available for Firefox on desktop and Firefox for Android.

FreeWebEmbeddableAndroid

Visit mozilla.org

Overview

5 features

CaptionSubtitleTool sits in PulseGate's Subtitles & captions category. It focuses on improving access to and control over captions and subtitles when watching online videos. CaptionSubtitleTool is a consumer product aimed at online video viewers who use captions or subtitles. CaptionSubtitleTool costs nothing to use. It ships for the web, embeddable surfaces, and Android.

It is developed by Firefox user 15314155, and it first shipped in 2024. Among its 5 catalogued features are caption controls, subtitle functions, and online video support. The interface is available in 32 languages, including Czech, German, and Greek.

Summary written by a language model from the project’s public pages.

Caption controls
Subtitle functions
Online video support
YouTube support
Firefox for Android

Built with & integrations

Runs on

BrowserEmbeddableAndroid

Trust & compliance

Verified signals

HTTPSPrivacy Policy Terms of ServiceFree tierMulti-languageStore-verified publisher

Legal

Indexing history

What PulseGate has recorded for this listing

Indexed10 Sept · 06:43 UTC
CaptionSubtitleTool verified via Firefox Add-ons
Source: Firefox Add-ons · Open

Frequently asked questions about CaptionSubtitleTool

What does CaptionSubtitleTool do?: CaptionSubtitleTool focuses on improving access to and control over captions and subtitles when watching online videos. It is catalogued under Subtitles & captions on PulseGate.
Who should use CaptionSubtitleTool?: CaptionSubtitleTool is a consumer product built for online video viewers who use captions or subtitles.
Is CaptionSubtitleTool free?: Yes — CaptionSubtitleTool is free to use.
What platforms does CaptionSubtitleTool run on?: CaptionSubtitleTool runs on the web, embeddable surfaces, and Android.
Is CaptionSubtitleTool still active?: Unverified. CaptionSubtitleTool has not been re-checked since it entered the index, so there is no finding either way — and only a positive finding would say otherwise.
What projects are similar to CaptionSubtitleTool?: Similar projects tracked by PulseGate include Alt Captioner, Caption Bank, and Shot Caption.Alt Captioner Caption Bank Shot Caption
Who develops CaptionSubtitleTool?: CaptionSubtitleTool is developed by Firefox user 15314155.
When did CaptionSubtitleTool launch?: CaptionSubtitleTool first shipped in 2024.

At a glance

Pricing: Free
Platforms: Web
Built for: online video viewers who use captions or subtitles
Model: B2C
Solves: Improving access to and control over captions and subtitles when watching online videos.

Registered as

Firefox Add-ons: time

Developer

Firefox user 15314155

Index record

Indexed: 10 Sept 2026
Lifecycle: Alive
Last seen: 10 Sept 2026

Identity audit (13)

Slug: captionsubtitletool-mozilla-org
Lifecycle state recorded: 10 Sept 2026
Verification state: Indexed for public listing
Listing state: Listed: yes
Index status: Included in index
Latest evidence snapshot: 10 Sept 2026
Timeline basis: Indexed-at chronology. This listing's first-seen date was written by the catalog backfill, not observed here, so it is not treated as a sighting.
Name from: Derived from the project's own page and URL.
Category from: Assigned by a language model.
Summary from: Written by a language model from public pages.
Languages from: Detected by a language model, checked against the page's own declaration.
Last updated: 10 Sept 2026
Canonical URL: https://addons.mozilla.org/en-US/firefox/addon/time

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