Who should use CustomCSS Injector?

CustomCSS Injector is a consumer product built for firefox users and web developers.

Does CustomCSS Injector have a free plan?

Yes — CustomCSS Injector is free to use.

What platforms does CustomCSS Injector run on?

CustomCSS Injector runs on the web and embeddable surfaces.

Is CustomCSS Injector still maintained?

Unverified. CustomCSS 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 projects are similar to CustomCSS Injector?

Similar projects tracked by PulseGate include Custom CSS, Code Injector, and Code Injectorvvbn.

Who makes CustomCSS Injector?

CustomCSS Injector is developed by blizz31.

When did CustomCSS Injector launch?

CustomCSS Injector first shipped in 2019.

Back to the index

CustomCSS Injector

Name: CustomCSS Injector
Author: blizz31

github.comBrowser DevTools & extensions

CustomCSS Injector is a Firefox browser extension that lets users add CSS content to webpages on the fly. It is intended for users and developers who need to test or apply temporary styling changes without editing a site's source files.

FreeWebEmbeddable

Visit github.com

Overview

4 features

CustomCSS Injector is a Browser DevTools & extensions project. It focuses on adding temporary custom CSS to webpages without modifying their source code. It is built as a consumer product for firefox users and web developers. CustomCSS Injector costs nothing to use. It runs on the web and embeddable surfaces.

Behind CustomCSS Injector is blizz31, and it first shipped in 2019. Among its 4 catalogued features are CSS injection, live webpage styling, and custom stylesheets.

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

CSS injection
Live webpage styling
Custom stylesheets
Firefox integration

Built with & integrations

Runs on

BrowserEmbeddable

Trust & compliance

Verified signals

HTTPSPrivacy Policy Terms of ServiceFree tierStore-verified publisher

Legal

Indexing history

What PulseGate has recorded for this listing

Indexed9 Sept · 04:12 UTC
CustomCSS Injector verified via Firefox Add-ons
Source: Firefox Add-ons · Open

Frequently asked questions about CustomCSS Injector

What is CustomCSS Injector?: CustomCSS Injector focuses on adding temporary custom CSS to webpages without modifying their source code. It is catalogued under Browser DevTools & extensions on PulseGate.
Who should use CustomCSS Injector?: CustomCSS Injector is a consumer product built for firefox users and web developers.
Does CustomCSS Injector have a free plan?: Yes — CustomCSS Injector is free to use.
What platforms does CustomCSS Injector run on?: CustomCSS Injector runs on the web and embeddable surfaces.
Is CustomCSS Injector still maintained?: Unverified. CustomCSS 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 projects are similar to CustomCSS Injector?: Similar projects tracked by PulseGate include Custom CSS, Code Injector, and Code Injectorvvbn.Custom CSS Code Injector Code Injectorvvbn
Who makes CustomCSS Injector?: CustomCSS Injector is developed by blizz31.
When did CustomCSS Injector launch?: CustomCSS Injector first shipped in 2019.

At a glance

Pricing: Free
Platforms: Web
Languages: English
First seen: 9 Sept 2026
Built for: Firefox users and web developers
Model: B2C
Solves: Adding temporary custom CSS to webpages without modifying their source code.

Registered as

Firefox Add-ons: customcss-injector

Developer

blizz31

Index record

Indexed: 9 Sept 2026
Lifecycle: Alive
First seen: Sept 2026
Last seen: 9 Sept 2026

Identity audit (13)

Slug: customcss-injector-github-com
Lifecycle state recorded: 9 Sept 2026
Verification state: Indexed for public listing
Listing state: Listed: yes
Index status: Included in index
Latest evidence snapshot: 9 Sept 2026
Timeline basis: Indexed-at chronology (no inferred launch/funding milestones).
Name from: Written by a language model from the project's public pages.
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: 9 Sept 2026
Canonical URL: https://github.com/blizz31/customcssinjector

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

Similar projects

Closest matches by what these projects do