What is Alt Captioner?

Alt Captioner focuses on making image alt and title text visible directly beneath images while browsing. It is catalogued under Browser DevTools & extensions on PulseGate.

Who should use Alt Captioner?

Alt Captioner is a consumer product built for firefox users who need quick access to image alt or title text.

Is Alt Captioner free?

Yes — Alt Captioner is free to use.

What platforms does Alt Captioner run on?

Alt Captioner runs on the web and embeddable surfaces.

Is Alt Captioner still active?

Unverified. Alt Captioner 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.

Who develops Alt Captioner?

Alt Captioner is developed by Joseph T.

When did Alt Captioner launch?

Alt Captioner first shipped in 2026.

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Alt Captioner

Name: Alt Captioner
Author: Joseph T.

mozilla.orgBrowser DevTools & extensions

Alt Captioner is a Firefox browser extension that shows an image's alt or title text beneath the image on the current page. It helps users inspect image descriptions and accessibility metadata without opening page source or developer tools.

FreeWebEmbeddable

Visit mozilla.org

Overview

5 features

Alt Captioner is a Browser DevTools & extensions project. It focuses on making image alt and title text visible directly beneath images while browsing. Alt Captioner is a consumer product aimed at firefox users who need quick access to image alt or title text. It is available for free. Alt Captioner is available on the web and embeddable surfaces.

It is developed by Joseph T., and it first shipped in 2026. Among its 5 catalogued features are alt text display, title text display, and in-page captions. The interface is available in 32 languages, including Czech, German, and Greek.

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

Alt text display
Title text display
In-page captions
No data collection
Firefox integration

Built with & integrations

Runs on

BrowserEmbeddable

Trust & compliance

Verified signals

HTTPSPrivacy Policy Terms of ServiceFree tierMulti-languageStore-verified publisher

Legal

Indexing history

What PulseGate has recorded for this listing

Indexed8 Sept · 00:26 UTC
Alt Captioner verified via Firefox Add-ons
Source: Firefox Add-ons · Open

Frequently asked questions about Alt Captioner

What is Alt Captioner?: Alt Captioner focuses on making image alt and title text visible directly beneath images while browsing. It is catalogued under Browser DevTools & extensions on PulseGate.
Who should use Alt Captioner?: Alt Captioner is a consumer product built for firefox users who need quick access to image alt or title text.
Is Alt Captioner free?: Yes — Alt Captioner is free to use.
What platforms does Alt Captioner run on?: Alt Captioner runs on the web and embeddable surfaces.
Is Alt Captioner still active?: Unverified. Alt Captioner 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.
Who develops Alt Captioner?: Alt Captioner is developed by Joseph T.
When did Alt Captioner launch?: Alt Captioner first shipped in 2026.
What languages does Alt Captioner support?: The interface is available in 32 languages, including Czech, German, and Greek.

At a glance

Pricing: Free
Platforms: Web
First seen: 8 Sept 2026
Built for: Firefox users who need quick access to image alt or title text
Model: B2C
Solves: Making image alt and title text visible directly beneath images while browsing.

Registered as

Firefox Add-ons: alt-captioner

Developer

Joseph T.

Index record

Indexed: 8 Sept 2026
Lifecycle: Alive
First seen: Sept 2026
Last seen: 8 Sept 2026

Identity audit (13)

Slug: alt-captioner-mozilla-org
Lifecycle last checked: 8 Sept 2026
Verification state: Indexed for public listing
Listing state: Listed: yes
Index status: Included in index
Latest evidence snapshot: 8 Sept 2026
Timeline basis: Indexed-at chronology (no inferred launch/funding milestones).
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: 8 Sept 2026
Canonical URL: https://addons.mozilla.org/en-US/firefox/addon/alt-captioner

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