Who is Run JavaScript for?

Run JavaScript is a consumer product built for firefox users and web developers.

Does Run JavaScript have a free plan?

Yes — Run JavaScript is free to use.

What platforms does Run JavaScript run on?

Run JavaScript runs on the web, embeddable surfaces, and Android.

Is Run JavaScript still maintained?

Unverified. Run JavaScript 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 makes Run JavaScript?

Run JavaScript is developed by datttyt.

How long has Run JavaScript been around?

Run JavaScript first shipped in 2025.

Back to the index

Run JavaScript

Name: Run JavaScript
Author: datttyt

mozilla.orgBrowser DevTools & extensions

Run JavaScript is a Firefox browser extension that injects custom JavaScript and CSS into websites. It is intended for Firefox users and web developers who need to run scripts or apply styles directly on web pages.

FreeWebEmbeddableAndroid

Visit mozilla.org

Overview

5 features

Run JavaScript sits in PulseGate's Browser DevTools & extensions category. It focuses on injecting custom JavaScript and CSS into web pages without manually modifying site files. Run JavaScript is a consumer product aimed at firefox users and web developers. Run JavaScript costs nothing to use. It ships for the web, embeddable surfaces, and Android.

Behind Run JavaScript is datttyt, and it first shipped in 2025. Key capabilities include javaScript injection, CSS injection, and website 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.

JavaScript injection
CSS injection
Website access
Firefox for Android
Script execution

Built with & integrations

Runs on

BrowserEmbeddableAndroid

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 · 11:33 UTC
Run JavaScript verified via Firefox Add-ons
Source: Firefox Add-ons · Open

Frequently asked questions about Run JavaScript

What does Run JavaScript do?: Run JavaScript focuses on injecting custom JavaScript and CSS into web pages without manually modifying site files. It is catalogued under Browser DevTools & extensions on PulseGate.
Who is Run JavaScript for?: Run JavaScript is a consumer product built for firefox users and web developers.
Does Run JavaScript have a free plan?: Yes — Run JavaScript is free to use.
What platforms does Run JavaScript run on?: Run JavaScript runs on the web, embeddable surfaces, and Android.
Is Run JavaScript still maintained?: Unverified. Run JavaScript 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 makes Run JavaScript?: Run JavaScript is developed by datttyt.
How long has Run JavaScript been around?: Run JavaScript first shipped in 2025.
What languages does Run JavaScript support?: The interface is available in 32 languages, including Czech, German, and Greek.

At a glance

Pricing: Free
Platforms: Web
Built for: Firefox users and web developers
Model: B2C
Solves: Injecting custom JavaScript and CSS into web pages without manually modifying site files.

Registered as

Firefox Add-ons: run-javascript

Developer

datttyt

Index record

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

Identity audit (13)

Slug: run-javascript-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. This listing's first-seen date was written by the catalog backfill, not observed here, so it is not treated as a sighting.
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/run-javascript

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