What is Per-Site CSS Injector?

Per-Site CSS Injector focuses on customizing individual websites without repeatedly reapplying CSS styles. It is catalogued under Browser DevTools & extensions on PulseGate.

Who is Per-Site CSS Injector for?

Per-Site CSS Injector is a consumer product built for firefox users who customize website appearance.

Does Per-Site CSS Injector have a free plan?

Yes — Per-Site CSS Injector is free to use.

What platforms does Per-Site CSS Injector run on?

Per-Site CSS Injector runs on the web and embeddable surfaces.

Is Per-Site CSS Injector still maintained?

Unverified. Per-Site CSS Injector 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 Per-Site CSS Injector?

Similar projects tracked by PulseGate include CustomCSS Injector, Custom CSS, and CSS/JS Inject.

Who makes Per-Site CSS Injector?

Per-Site CSS Injector is developed by matt chavoshi.

How long has Per-Site CSS Injector been around?

Per-Site CSS Injector first shipped in 2025.

Back to the index

Per-Site CSS Injector

Name: Per-Site CSS Injector
Author: matt chavoshi

mozilla.orgBrowser DevTools & extensions

Per-Site CSS Injector is a Firefox extension for applying custom CSS to individual websites. Users can enter and save domain-specific styles in the browser, which are automatically reapplied whenever they revisit those sites.

FreeWebEmbeddable

Visit mozilla.org

Overview

5 features

Per-Site CSS Injector is a Browser DevTools & extensions project. It focuses on customizing individual websites without repeatedly reapplying CSS styles. Per-Site CSS Injector is a consumer product aimed at firefox users who customize website appearance. Per-Site CSS Injector costs nothing to use. Per-Site CSS Injector is available on the web and embeddable surfaces.

matt chavoshi builds and maintains Per-Site CSS Injector, and it first shipped in 2025. Among its 5 catalogued features are site-specific styling, persistent storage, and Custom CSS editor. The interface is available in 32 languages, including Czech, German, and Greek.

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

Site-specific styling
Persistent storage
Custom CSS editor
Automatic style application
Browser toolbar access

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

Indexed16 Sep · 18:33 UTC
Per-Site CSS Injector verified via Firefox Add-ons
Source: Firefox Add-ons · Open

Frequently asked questions about Per-Site CSS Injector

What is Per-Site CSS Injector?: Per-Site CSS Injector focuses on customizing individual websites without repeatedly reapplying CSS styles. It is catalogued under Browser DevTools & extensions on PulseGate.
Who is Per-Site CSS Injector for?: Per-Site CSS Injector is a consumer product built for firefox users who customize website appearance.
Does Per-Site CSS Injector have a free plan?: Yes — Per-Site CSS Injector is free to use.
What platforms does Per-Site CSS Injector run on?: Per-Site CSS Injector runs on the web and embeddable surfaces.
Is Per-Site CSS Injector still maintained?: Unverified. Per-Site CSS Injector 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 Per-Site CSS Injector?: Similar projects tracked by PulseGate include CustomCSS Injector, Custom CSS, and CSS/JS Inject.CustomCSS Injector Custom CSS CSS/JS Inject
Who makes Per-Site CSS Injector?: Per-Site CSS Injector is developed by matt chavoshi.
How long has Per-Site CSS Injector been around?: Per-Site CSS Injector first shipped in 2025.

At a glance

Pricing: Free
Platforms: Web
Built for: Firefox users who customize website appearance
Model: B2C
Solves: Customizing individual websites without repeatedly reapplying CSS styles.

Registered as

Firefox Add-ons: per-site-css-injector

Developer

matt chavoshi

Index record

Indexed: 16 Sep 2026
Lifecycle: Alive
Last seen: 16 Sep 2026

Identity audit (13)

Slug: per-site-css-injector-mozilla-org
Lifecycle state recorded: 16 Sep 2026
Verification state: Indexed for public listing
Listing state: Listed: yes
Index status: Included in index
Latest evidence snapshot: 16 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: 16 Sep 2026
Canonical URL: https://addons.mozilla.org/en-US/firefox/addon/per-site-css-injector

Ship this? Send a correction — no account, and you get a link to follow it.

Similar projects

Closest matches by what these projects do