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FireLens

mozilla.orgBrowser DevTools & extensions

PulseGate's liveness check found it on 20 Sep 2026; it is registered on Firefox Add-ons and has been in the index since 20 Sep 2026. How this is checked

FireLens is a Firefox extension for testing website accessibility. It simulates visual impairments, including blindness and color blindness, and visually tracks keyboard tab navigation so developers can inspect navigation flow.

Inferred · not functionally tested

FreeWebEmbeddable
FireLens preview
Visit mozilla.org

Overview

6 features

Purpose: Testing website accessibility by simulating visual impairments and visualizing keyboard navigation flow.

Inferred · not functionally tested

Audience: web developers and accessibility testers

Inferred · not functionally tested

Functions: Unknown

Interfaces: API: unknown · MCP: unknown · CLI: unknown · Self-hosting: unknown

Recorded constraints: pricing: free · license: Proprietary · platforms: WEB · deployment: browser, embeddable

Constraint provenance is unknown; confirm requirements with the publisher.

Record sources: addons.mozilla.org · addons.mozilla.org. These links do not verify the individual claims.

In the Browser DevTools & extensions space, FireLens takes a focused approach. Inferred · not functionally tested: It focuses on testing website accessibility by simulating visual impairments and visualizing keyboard navigation flow. Inferred · not functionally tested: It is built as a B2B product for web developers and accessibility testers. Basis unknown · not verified: It is available for free. Basis unknown · not verified: It runs on the web and embeddable surfaces.

Francesco De Stefano builds and maintains FireLens, and it first shipped in 2019. Inferred · not functionally tested: Among its 6 catalogued features are vision simulation, color blindness simulation, and blindness simulation. The interface is available in 32 languages, including Czech, German, and Greek.

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

Tasks: Inferred · not functionally tested

  • Vision simulation
  • Color blindness simulation
  • Blindness simulation
  • Tab tracking
  • Keyboard navigation testing
  • Website accessibility testing

Topics: Inferred · not functionally tested

Tags
accessibility-testingvision-simulationkeyboard-navigationfirefox-extension

JSON profile · Text profile · Access guide

Built with & integrations

Runs on
BrowserEmbeddable

Trust & compliance

Public signals
HTTPSPrivacy PolicyTerms of ServiceFree tierMulti-languageStore listing found
Legal
Privacy Policy Terms of Service

Indexing history

1

What PulseGate has recorded for this listing

  1. Indexed20 Sep · 10:54 UTC
    FireLens seen via Firefox Add-ons
    Source: Firefox Add-ons · Open

Frequently asked questions about FireLens

What does FireLens do?
Inferred · not functionally tested: FireLens focuses on testing website accessibility by simulating visual impairments and visualizing keyboard navigation flow. It is catalogued under Browser DevTools & extensions on PulseGate.
Who should use FireLens?
Inferred · not functionally tested: FireLens is a B2B product built for web developers and accessibility testers.
Is FireLens free?
Basis unknown · not verified: Yes — FireLens is free to use.
What platforms does FireLens run on?
Basis unknown · not verified: FireLens runs on the web and embeddable surfaces.
Is FireLens still active?
PulseGate's liveness check found it on 20 Sep 2026.
What projects are similar to FireLens?
Similar projects tracked by PulseGate include blindify, Firefocus, and NetLens.blindifyFirefocusNetLens
Who makes FireLens?
FireLens is developed by Francesco De Stefano.
When did FireLens launch?
FireLens first shipped in 2019.

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