What is Site Customizer?

Site Customizer focuses on customizing website appearance and accessibility without writing CSS. It is catalogued under Browser DevTools & extensions on PulseGate.

Who should use Site Customizer?

Site Customizer is a consumer product built for firefox users who want to personalize website appearance or accessibility.

Does Site Customizer have a free plan?

Yes — Site Customizer is free to use.

What platforms does Site Customizer run on?

Site Customizer runs on the web and embeddable surfaces.

Is Site Customizer still maintained?

Unverified. Site Customizer 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 Site Customizer?

Similar projects tracked by PulseGate include Customizer styles and scripts, Site Switcher, and Custom CSS.

Who develops Site Customizer?

Site Customizer is developed by Andrew H.

How long has Site Customizer been around?

Site Customizer first shipped in 2024.

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Site Customizer

Name: Site Customizer
Author: Andrew H.

mozilla.orgBrowser DevTools & extensions

Site Customizer is a Firefox extension that lets users edit website appearance through an in-page editor and contextual controls. It supports styling page elements, hiding unwanted content, saving changes locally per site, and exporting or importing generated CSS.

FreeWebEmbeddable

Visit mozilla.org

Overview

8 features

Site Customizer sits in PulseGate's Browser DevTools & extensions category. It focuses on customizing website appearance and accessibility without writing CSS. Site Customizer is a consumer product aimed at firefox users who want to personalize website appearance or accessibility. Site Customizer costs nothing to use. It runs on the web and embeddable surfaces.

Behind Site Customizer is Andrew H., and it first shipped in 2024. Among its 8 catalogued features are in-page editor, right-click editing, and style adjustments. The interface is available in 32 languages, including Czech, German, and Greek.

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

In-page editor
Right-click editing
Style adjustments
Hide page elements
Local saving
CSS export
CSS import
Site-wide changes

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

Indexed17 Sep · 15:02 UTC
Site Customizer verified via Firefox Add-ons
Source: Firefox Add-ons · Open

Frequently asked questions about Site Customizer

What is Site Customizer?: Site Customizer focuses on customizing website appearance and accessibility without writing CSS. It is catalogued under Browser DevTools & extensions on PulseGate.
Who should use Site Customizer?: Site Customizer is a consumer product built for firefox users who want to personalize website appearance or accessibility.
Does Site Customizer have a free plan?: Yes — Site Customizer is free to use.
What platforms does Site Customizer run on?: Site Customizer runs on the web and embeddable surfaces.
Is Site Customizer still maintained?: Unverified. Site Customizer 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 Site Customizer?: Similar projects tracked by PulseGate include Customizer styles and scripts, Site Switcher, and Custom CSS.Customizer styles and scripts Site Switcher Custom CSS
Who develops Site Customizer?: Site Customizer is developed by Andrew H.
How long has Site Customizer been around?: Site Customizer first shipped in 2024.

At a glance

Pricing: Free
Platforms: Web
Built for: Firefox users who want to personalize website appearance or accessibility
Model: B2C
Solves: Customizing website appearance and accessibility without writing CSS.

Registered as

Firefox Add-ons: site-customizer

Developer

Andrew H.

Index record

Indexed: 17 Sep 2026
Lifecycle: Alive
Last seen: 17 Sep 2026

Identity audit (13)

Slug: site-customizer-mozilla-org
Lifecycle state recorded: 17 Sep 2026
Verification state: Indexed for public listing
Listing state: Listed: yes
Index status: Included in index
Latest evidence snapshot: 17 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: 17 Sep 2026
Canonical URL: https://addons.mozilla.org/en-US/firefox/addon/site-customizer

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