Who is Window Resizer for?

Window Resizer is a consumer product built for firefox users and web developers testing responsive layouts.

What platforms does Window Resizer run on?

Window Resizer runs on the web and embeddable surfaces.

Is Window Resizer still active?

Unverified. Window Resizer 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 Window Resizer?

Window Resizer is developed by antwhere.com.

When did Window Resizer launch?

Window Resizer first shipped in 2020.

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Window Resizer

Name: Window Resizer
Author: antwhere.com

mozilla.orgBrowser DevTools & extensions

Window Resizer is an open-source Firefox extension that resizes the browser window to selected dimensions. Users can customize resolution presets and edit the available size list, making it useful for responsive web testing.

Open SourceWebEmbeddable

Visit mozilla.org

Overview

4 features

Window Resizer is a Browser DevTools & extensions project. It focuses on resizing browser windows to specific dimensions without manually adjusting them each time. Window Resizer is a consumer product aimed at firefox users and web developers testing responsive layouts. Window Resizer is open source under the Open Source license. It runs on the web and embeddable surfaces.

It is developed by antwhere.com, and it first shipped in 2020. Key capabilities include window resizing, resolution presets, and custom resolutions. The interface is available in 32 languages, including Czech, German, and Greek.

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

Window resizing
Resolution presets
Custom resolutions
Preset editing

Built with & integrations

Runs on

BrowserEmbeddable

Trust & compliance

License

Open Source

Verified signals

HTTPSPrivacy Policy Terms of ServiceOpen SourceFree tierMulti-languageStore-verified publisher

Legal

Indexing history

What PulseGate has recorded for this listing

Indexed8 Sept · 20:01 UTC
Window Resizer verified via Firefox Add-ons
Source: Firefox Add-ons · Open

Frequently asked questions about Window Resizer

What does Window Resizer do?: Window Resizer focuses on resizing browser windows to specific dimensions without manually adjusting them each time. It is catalogued under Browser DevTools & extensions on PulseGate.
Who is Window Resizer for?: Window Resizer is a consumer product built for firefox users and web developers testing responsive layouts.
Does Window Resizer have a free plan?: Yes — Window Resizer is open source under the Open Source license and free to use.
What platforms does Window Resizer run on?: Window Resizer runs on the web and embeddable surfaces.
Is Window Resizer still active?: Unverified. Window Resizer 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 Window Resizer?: Window Resizer is developed by antwhere.com.
When did Window Resizer launch?: Window Resizer first shipped in 2020.
Is Window Resizer open source?: Yes — Window Resizer is open source under the Open Source license.

At a glance

Pricing: Open Source
Platforms: Web
License: Open Source
First seen: 8 Sept 2026
Built for: Firefox users and web developers testing responsive layouts
Model: B2C
Solves: Resizing browser windows to specific dimensions without manually adjusting them each time.

Registered as

Firefox Add-ons: window-resizer-antwhere

Developer

antwhere.com

Index record

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

Identity audit (13)

Slug: window-resizer-mozilla-org
Lifecycle state recorded: 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/window-resizer-antwhere

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