What is CSS Override?

CSS Override focuses on applying custom CSS to websites without modifying their source code. It is catalogued under Browser DevTools & extensions on PulseGate.

Who should use CSS Override?

CSS Override is an open-source project built for web developers and users who customize websites.

Is CSS Override free?

Yes — CSS Override is open source under the Open Source license and free to use.

What platforms does CSS Override run on?

CSS Override runs on the web and embeddable surfaces.

Is CSS Override still active?

Unverified. CSS Override 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.

Who makes CSS Override?

CSS Override is developed by swcolegrove.

How long has CSS Override been around?

CSS Override first shipped in 2019.

Is CSS Override open source?

Yes — CSS Override is open source under the Open Source license.

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CSS Override

Name: CSS Override
Author: swcolegrove

github.comBrowser DevTools & extensions

CSS Override is an open-source browser extension that lets users add and apply custom CSS rules to websites. It is intended for developers and advanced users who want to customize webpage appearance without changing site source files.

Open SourceWebEmbeddable

Visit github.com

Overview

4 features

CSS Override is a Browser DevTools & extensions project. It focuses on applying custom CSS to websites without modifying their source code. CSS Override is an open-source project aimed at web developers and users who customize websites. The project is open source (Open Source). It ships for the web and embeddable surfaces.

swcolegrove builds and maintains CSS Override, and it first shipped in 2019. Key capabilities include Custom CSS rules, website styling, and browser extension.

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

Custom CSS rules
Website styling
Browser extension
Per-site customization

Built with & integrations

Runs on

BrowserEmbeddable

Trust & compliance

License

Open Source

Verified signals

HTTPSPrivacy Policy Terms of ServiceOpen SourceFree tierStore-verified publisher

Legal

Indexing history

What PulseGate has recorded for this listing

Indexed8 Sept · 13:26 UTC
CSS Override verified via Firefox Add-ons
Source: Firefox Add-ons · Open

Frequently asked questions about CSS Override

What is CSS Override?: CSS Override focuses on applying custom CSS to websites without modifying their source code. It is catalogued under Browser DevTools & extensions on PulseGate.
Who should use CSS Override?: CSS Override is an open-source project built for web developers and users who customize websites.
Is CSS Override free?: Yes — CSS Override is open source under the Open Source license and free to use.
What platforms does CSS Override run on?: CSS Override runs on the web and embeddable surfaces.
Is CSS Override still active?: Unverified. CSS Override 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.
Who makes CSS Override?: CSS Override is developed by swcolegrove.
How long has CSS Override been around?: CSS Override first shipped in 2019.
Is CSS Override open source?: Yes — CSS Override is open source under the Open Source license.

At a glance

Pricing: Open Source
Platforms: Web
Languages: English
License: Open Source
First seen: 8 Sept 2026
Built for: web developers and users who customize websites
Model: Open source
Solves: Applying custom CSS to websites without modifying their source code.

Registered as

Firefox Add-ons: css-override

Developer

swcolegrove

Index record

Indexed: 8 Sept 2026
Lifecycle: Alive
First seen: Sept 2026
Last seen: 8 Sept 2026

Identity audit (13)

Slug: css-override-github-com
Lifecycle state recorded: 8 Sept 2026
Verification state: Indexed for public listing
Listing state: Listed: yes
Index status: Included in index
Latest evidence snapshot: 8 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: 8 Sept 2026
Canonical URL: https://github.com/swcolegrove/css-override-web-extension

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