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Responsive Check

mozilla.orgBrowser DevTools & extensions

PulseGate's liveness check found it on 14 Sep 2026; it is registered on Firefox Add-ons and has been in the index since 14 Sep 2026. How this is checked

Responsive Check is a Firefox extension that lets users test a webpage at multiple screen resolutions simultaneously. Users can add custom resolutions and launch the tool from the page they are testing, making it useful for web developers and designers.

Inferred · not functionally tested

FreeWebEmbeddable
Responsive Check preview
Visit mozilla.org

Overview

4 features

Purpose: Testing website layouts across multiple screen resolutions without repeatedly resizing the browser.

Inferred · not functionally tested

Audience: web developers and designers

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, Responsive Check takes a focused approach. Inferred · not functionally tested: It focuses on testing website layouts across multiple screen resolutions without repeatedly resizing the browser. Inferred · not functionally tested: It is built as a B2B product for web developers and designers. Basis unknown · not verified: Responsive Check is free to use. Basis unknown · not verified: It ships for the web and embeddable surfaces.

fernando builds and maintains Responsive Check, and it first shipped in 2023. Inferred · not functionally tested: Among its 4 catalogued features are multi-screen preview, custom resolutions, and browser tab access. 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

  • Multi-screen preview
  • Custom resolutions
  • Browser tab access
  • Website testing

Topics: Inferred · not functionally tested

Tags
responsive-testingscreen-resolution-previewfirefox-extensionweb-development

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. Indexed14 Sep · 10:02 UTC
    Responsive Check seen via Firefox Add-ons
    Source: Firefox Add-ons · Open

Frequently asked questions about Responsive Check

What does Responsive Check do?
Inferred · not functionally tested: Responsive Check focuses on testing website layouts across multiple screen resolutions without repeatedly resizing the browser. It is catalogued under Browser DevTools & extensions on PulseGate.
Who is Responsive Check for?
Inferred · not functionally tested: Responsive Check is a B2B product built for web developers and designers.
Does Responsive Check have a free plan?
Basis unknown · not verified: Yes — Responsive Check is free to use.
What platforms does Responsive Check run on?
Basis unknown · not verified: Responsive Check runs on the web and embeddable surfaces.
Is Responsive Check still active?
PulseGate's liveness check found it on 14 Sep 2026.
What projects are similar to Responsive Check?
Similar projects tracked by PulseGate include Responsive Design Tester Pro, Responsive Checker, and Responsive Test Cache Cleaner.Responsive Design Tester ProResponsive CheckerResponsive Test Cache Cleaner
Who makes Responsive Check?
Responsive Check is developed by fernando.
When did Responsive Check launch?
Responsive Check first shipped in 2023.

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