What does JS and CSS snippets for web do?

Testing, debugging, and customizing websites without repeatedly pasting JavaScript or CSS code. It is catalogued under Browser DevTools & extensions on PulseGate.

Who is JS and CSS snippets for web for?

JS and CSS snippets for web is a consumer product built for web developers, QA engineers, and power users.

Is JS and CSS snippets for web free?

Yes — JS and CSS snippets for web is free to use.

What platforms does JS and CSS snippets for web run on?

JS and CSS snippets for web runs on the web, embeddable surfaces, and Android.

Is JS and CSS snippets for web still active?

Unverified. JS and CSS snippets for web 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.

What projects are similar to JS and CSS snippets for web?

Similar projects tracked by PulseGate include CSS/JS Inject, User JavaScript and CSS, and Run JavaScript.

Who develops JS and CSS snippets for web?

JS and CSS snippets for web is developed by Yupma.

When did JS and CSS snippets for web launch?

JS and CSS snippets for web first shipped in 2026.

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JS and CSS snippets for web

Name: JS and CSS snippets for web
Author: Yupma

mozilla.orgBrowser DevTools & extensions

JS and CSS snippets for web is a Firefox extension for creating and managing code snippets that run automatically on matching websites. It supports JavaScript and CSS injection, URL and regular-expression rules, enable/disable controls, a built-in editor, and dynamic pages including SPAs and iframes.

FreeWebEmbeddableAndroid

Visit mozilla.org

Overview

9 features

JS and CSS snippets for web sits in PulseGate's Browser DevTools & extensions category. Testing, debugging, and customizing websites without repeatedly pasting JavaScript or CSS code. JS and CSS snippets for web is a consumer product aimed at web developers, QA engineers, and power users. JS and CSS snippets for web is free to use. JS and CSS snippets for web is available on the web, embeddable surfaces, and Android.

It is developed by Yupma, and it first shipped in 2026. Key capabilities include javaScript injection, CSS injection, and URL rules. 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
URL rules
Regex matching
Snippet toggles
Persistent execution
SPA support
Iframe support
Code editor

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

Indexed14 Sep · 00:52 UTC
JS and CSS snippets for web verified via Firefox Add-ons
Source: Firefox Add-ons · Open

Frequently asked questions about JS and CSS snippets for web

What does JS and CSS snippets for web do?: Testing, debugging, and customizing websites without repeatedly pasting JavaScript or CSS code. It is catalogued under Browser DevTools & extensions on PulseGate.
Who is JS and CSS snippets for web for?: JS and CSS snippets for web is a consumer product built for web developers, QA engineers, and power users.
Is JS and CSS snippets for web free?: Yes — JS and CSS snippets for web is free to use.
What platforms does JS and CSS snippets for web run on?: JS and CSS snippets for web runs on the web, embeddable surfaces, and Android.
Is JS and CSS snippets for web still active?: Unverified. JS and CSS snippets for web 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.
What projects are similar to JS and CSS snippets for web?: Similar projects tracked by PulseGate include CSS/JS Inject, User JavaScript and CSS, and Run JavaScript.CSS/JS Inject User JavaScript and CSS Run JavaScript
Who develops JS and CSS snippets for web?: JS and CSS snippets for web is developed by Yupma.
When did JS and CSS snippets for web launch?: JS and CSS snippets for web first shipped in 2026.

At a glance

Pricing: Free
Platforms: Web
First seen: 14 Sep 2026
Built for: web developers, QA engineers, and power users
Model: B2C
Solves: Testing, debugging, and customizing websites without repeatedly pasting JavaScript or CSS code.

Registered as

Firefox Add-ons: js-and-css-snippets-for-web

Developer

Yupma

Index record

Indexed: 14 Sep 2026
Lifecycle: Alive
First seen: Sep 2026
Last seen: 14 Sep 2026

Identity audit (13)

Slug: js-and-css-snippets-for-web-mozilla-org
Lifecycle state recorded: 14 Sep 2026
Verification state: Indexed for public listing
Listing state: Listed: yes
Index status: Included in index
Latest evidence snapshot: 14 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: 14 Sep 2026
Canonical URL: https://addons.mozilla.org/en-US/firefox/addon/js-and-css-snippets-for-web

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