What does CSS Selector Helper do?

CSS Selector Helper focuses on identifying and validating CSS selectors on complex web pages, including pages with iframes. It is catalogued under Browser DevTools & extensions on PulseGate.

Who is CSS Selector Helper for?

CSS Selector Helper is a consumer product built for firefox users and web developers.

Is CSS Selector Helper free?

Yes — CSS Selector Helper is free to use.

What platforms does CSS Selector Helper run on?

CSS Selector Helper runs on the web and embeddable surfaces.

Is CSS Selector Helper still active?

Unverified. CSS Selector Helper 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 are alternatives to CSS Selector Helper?

Similar projects tracked by PulseGate include CSS Selector Finder, CSS Selector, and CSS Validation Checker.

Who makes CSS Selector Helper?

CSS Selector Helper is developed by Brentbacker.

How long has CSS Selector Helper been around?

CSS Selector Helper first shipped in 2025.

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CSS Selector Helper

Name: CSS Selector Helper
Author: Brentbacker

mozilla.orgBrowser DevTools & extensions

CSS Selector Helper is a Firefox browser extension for identifying and validating CSS selectors on complex web pages. It includes support for pages containing iframes and extends developer tools to inspect open tabs.

FreeWebEmbeddable

Visit mozilla.org

Overview

5 features

CSS Selector Helper is a Browser DevTools & extensions project. CSS Selector Helper is a consumer product aimed at firefox users and web developers. It is available for free. CSS Selector Helper is available on the web and embeddable surfaces.

Behind CSS Selector Helper is Brentbacker, and it first shipped in 2025. Among its 5 catalogued features are selector identification, selector validation, and iframe support. The interface is available in 32 languages, including Czech, German, and Greek.

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

Selector identification
Selector validation
Iframe support
Developer tools integration
Open-tab inspection

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

Indexed19 Sep · 20:01 UTC
CSS Selector Helper verified via Firefox Add-ons
Source: Firefox Add-ons · Open

Frequently asked questions about CSS Selector Helper

What does CSS Selector Helper do?: CSS Selector Helper focuses on identifying and validating CSS selectors on complex web pages, including pages with iframes. It is catalogued under Browser DevTools & extensions on PulseGate.
Who is CSS Selector Helper for?: CSS Selector Helper is a consumer product built for firefox users and web developers.
Is CSS Selector Helper free?: Yes — CSS Selector Helper is free to use.
What platforms does CSS Selector Helper run on?: CSS Selector Helper runs on the web and embeddable surfaces.
Is CSS Selector Helper still active?: Unverified. CSS Selector Helper 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 are alternatives to CSS Selector Helper?: Similar projects tracked by PulseGate include CSS Selector Finder, CSS Selector, and CSS Validation Checker.CSS Selector Finder CSS Selector CSS Validation Checker
Who makes CSS Selector Helper?: CSS Selector Helper is developed by Brentbacker.
How long has CSS Selector Helper been around?: CSS Selector Helper first shipped in 2025.

At a glance

Pricing: Free
Platforms: Web
Built for: Firefox users and web developers
Model: B2C
Solves: Identifying and validating CSS selectors on complex web pages, including pages with iframes.

Registered as

Firefox Add-ons: css-selector-helper

Developer

Brentbacker

Index record

Indexed: 19 Sep 2026
Lifecycle: Alive
Last seen: 19 Sep 2026

Identity audit (13)

Slug: css-selector-helper-mozilla-org
Lifecycle state recorded: 19 Sep 2026
Verification state: Indexed for public listing
Listing state: Listed: yes
Index status: Included in index
Latest evidence snapshot: 19 Sep 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: 19 Sep 2026
Canonical URL: https://addons.mozilla.org/en-US/firefox/addon/css-selector-helper

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