What does ActiveFlash do?

ActiveFlash focuses on testing websites that depend on navigator.platform or mobile viewport detection. It is catalogued under Browser DevTools & extensions on PulseGate.

Who is ActiveFlash for?

ActiveFlash is a B2B product built for web developers and browser testers.

Yes — ActiveFlash is free to use.

What platforms does ActiveFlash run on?

ActiveFlash runs on the web and embeddable surfaces.

Is ActiveFlash still maintained?

Unverified. ActiveFlash 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 ActiveFlash?

ActiveFlash is developed by 李先生.

How long has ActiveFlash been around?

ActiveFlash first shipped in 2020.

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ActiveFlash

Name: ActiveFlash
Author: 李先生

mozilla.orgBrowser DevTools & extensions

ActiveFlash is a Firefox browser extension for modifying the navigator.platform value while simulating a mobile viewport. It is intended for web developers and testers validating responsive behavior and platform-dependent website logic.

FreeWebEmbeddable

Visit mozilla.org

Overview

5 features

ActiveFlash sits in PulseGate's Browser DevTools & extensions category. It focuses on testing websites that depend on navigator.platform or mobile viewport detection. ActiveFlash is a B2B product aimed at web developers and browser testers. ActiveFlash costs nothing to use. ActiveFlash is available on the web and embeddable surfaces.

李先生 builds and maintains ActiveFlash, and it first shipped in 2020. Key capabilities include platform spoofing, mobile viewport simulation, and firefox integration. The interface is available in 32 languages, including Czech, German, and Greek.

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

Platform spoofing
Mobile viewport simulation
Firefox integration
Website testing
Permission management

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

Indexed10 Sep · 03:30 UTC
ActiveFlash verified via Firefox Add-ons
Source: Firefox Add-ons · Open

Frequently asked questions about ActiveFlash

What does ActiveFlash do?: ActiveFlash focuses on testing websites that depend on navigator.platform or mobile viewport detection. It is catalogued under Browser DevTools & extensions on PulseGate.
Who is ActiveFlash for?: ActiveFlash is a B2B product built for web developers and browser testers.
Is ActiveFlash free?: Yes — ActiveFlash is free to use.
What platforms does ActiveFlash run on?: ActiveFlash runs on the web and embeddable surfaces.
Is ActiveFlash still maintained?: Unverified. ActiveFlash 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 ActiveFlash?: ActiveFlash is developed by 李先生.
How long has ActiveFlash been around?: ActiveFlash first shipped in 2020.
What languages does ActiveFlash support?: The interface is available in 32 languages, including Czech, German, and Greek.

At a glance

Pricing: Free
Platforms: Web
First seen: 10 Sep 2026
Built for: web developers and browser testers
Model: B2B
Solves: Testing websites that depend on navigator.platform or mobile viewport detection.

Registered as

Firefox Add-ons: activeflash

Developer

李先生

Index record

Indexed: 10 Sep 2026
Lifecycle: Alive
First seen: Sep 2026
Last seen: 10 Sep 2026

Identity audit (13)

Slug: activeflash-mozilla-org
Lifecycle state recorded: 10 Sep 2026
Verification state: Indexed for public listing
Listing state: Listed: yes
Index status: Included in index
Latest evidence snapshot: 10 Sep 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: 10 Sep 2026
Canonical URL: https://addons.mozilla.org/en-US/firefox/addon/activeflash

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