Per-Domain User CSS

Name: Per-Domain User CSS
Author: ArachnidFight

Add custom CSS per domain. Modify fonts, colors, and layouts on any website. Each domain has its own saved style. Includes enable/disable toggle, preview, and save options.

Download

Install

Features & Capabilities

Per-Domain User CSS lets you restyle websites exactly how you want. If a page uses an unreadable font or bright background, you can fix it instantly. The extension stores your custom CSS separately for each exact domain (for example, test.example.com and example.com are treated independently).

Features

Apply custom CSS per exact domain or subdomain.
Toggle styles on or off anytime.
Preview your changes before saving.
Optionally auto-add !important to each rule.
Simple popup interface with textarea editor.

Lightweight and private — all data stored locally.

How it works

Open a site and click the extension icon.
Write your CSS in the popup.
Click Preview to test or Save to store it.
Enable/disable with the checkbox.

The extension injects your CSS automatically each time you visit that same domain. It never sends data anywhere and requires no network access.

User Growth & Download Statistics

Add-on

By:

ArachnidFight

Daily users:

12 1

Version:

1.0.1 Last updated: 2025-11-06

Version code:

6067161

Creation date:

2025-11-03

Risk:

Permissions:

storage
tabs
<all_urls>

Content scripts matches:

<all_urls>

Size:

13.88KB

Full description:

Source:

Firefox Add-ons Store

Data ingested on:

2026-06-04

Compare stats and ranking:

Ranking

# 29,315 ▲ 1,057

Other rankings

#30 in domain keyword 26 ▼ 1

For Developers

Monetize with App Pass Boost with Extension Booster

Contact the developer

Chrome-Stats does not own this Firefox add-on. Please use these information below to contact the Firefox add-on developer.

Developed by:

ArachnidFight

Firefox Add-ons Store

https://addons.mozilla.org/firefox/addon/per-domain-user-css/

Is Per-Domain User CSS Safe?

Risk impact

Risk impact measures the level of extra permissions an extension has access to. A low risk impact extension cannot do much harms, whereas a high risk impact extension can do a lot of damage like stealing your password, bypassing your security settings, and accessing your personal data. High risk impact extensions are not necessarily malicious. However, if they do turn malicious, they can be very harmful.

Per-Domain User CSS requires some sensitive permissions that could impact your browser and data security. Exercise caution before installing.

Risk impact analysis details

Critical Grants access to browser tabs, which can be used to track user browsing habits and history, presenting a privacy concern.
Critical ****** ****** ** *** ********* ****** * *********** ******** **** ** ** *** ******* *** ****** **** **** *** ******* *****
High ******* ******* **** *** ****** ***** *** ***** ** ******* **** ********* ********* ** * *********** *****

Risk likelihood

Risk likelihood measures the probability that a Firefox add-on may turn malicious. This is determined by the publisher and the Firefox add-on reputation on Firefox Add-ons Store, the amount of time the Firefox add-on has been around, and other signals about the Firefox add-on. Our algorithms are not perfect, and are subject to change as we discover new ways to detect malicious extensions. We recommend that you always exercise caution when installing a Firefox add-on.

Per-Domain User CSS is probably trust-worthy. Prefer other publishers if available. Exercise caution when installing this add-on.

Risk likelihood analysis details

High This extension has low user count. Unpopular extensions may not be stable or safe.
Low **** ********* *** ******* **** **** * ****** **** ***** ******** *** **** ****** ** ** ****** *** *****
Low **** ********* *** ***** **** **** * ****** **** ***** ********** *** **** ****** ** ** ****** *** *****