# Custom Style Manager

> Custom Style Manager allows domain-level CSS styling for any website you visit. Your changes will sync across all of your logged-in Firefox browsers.

Canonical page: [https://chrome-stats.com/d/customstylemanager](https://chrome-stats.com/d/customstylemanager)

## Overview

- **ID:** `customstylemanager`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** Halil Can
- **Category:** web-development,appearance
- **Daily users:** 3
- **Rating:** 2.67 / 5 (3 ratings)
- **Version:** 1.0.3
- **Last updated:** 2020-08-05
- **First published:** 2020-08-05
- **Size:** 113 KB
- **Data as of:** 2026-09-05
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/customstylemanager/)
- **Website:** [https://github.com/HalilCan/customStyleManager](https://github.com/HalilCan/customStyleManager)

## Description

Custom Style Manager is a Firefox add-on that enables domain-level CSS styling for websites. Changes made sync across all logged-in Firefox browsers.

## Rankings

- #52,133 — Overall
- #149 — style
- #214 — custom feed
- #215 — custom font
- #227 — customer

## Permissions and access

### Permissions

- `activeTab`
- `tabs`
- `storage`

### Content script matches

- `<all_urls>`

## Safety

- **Risk impact:** High risk impact
- **Risk likelihood:** Moderate risk likelihood

### Analysis details

- Grants access to browser tabs, which can be used to track user browsing habits and history, presenting a privacy concern.
- This extension has low user count. Unpopular extensions may not be stable or safe.

> Some risk analysis details are omitted from this free response. [Upgrade to view the full analysis](https://chrome-stats.com/pricing).

## Similar extensions and apps

- [Site Customizer](https://chrome-stats.com/d/site-customizer) — 12 users, 5.00 / 5
- [Website Theme Manager](https://chrome-stats.com/d/website-theme-manager) — 5 users, 2.50 / 5
- [CSS Edit](https://chrome-stats.com/d/css-edit) — 12 users
- [Customizer](https://chrome-stats.com/d/customizer-by-robustus)
- [Custom CSS rules](https://chrome-stats.com/d/custom-css-rules) — 3 users
- [Style Disabler](https://chrome-stats.com/d/style-disabler)
- [CSS Override](https://chrome-stats.com/d/css-override) — 2,003 users, 4.21 / 5
- [HM Style](https://chrome-stats.com/d/hm-style)
- [Your Custom Css](https://chrome-stats.com/d/your-custom-css) — 96 users
- [Custom Style](https://chrome-stats.com/d/custom-style) — 7 users, 4.33 / 5
- [Custom Style Script](https://chrome-stats.com/d/custom-style-script) — 1,902 users, 3.85 / 5
- [Per-Site CSS Injector](https://chrome-stats.com/d/per-site-css-injector) — 17 users, 5.00 / 5

---

Source: [Chrome-Stats](https://chrome-stats.com/d/customstylemanager)