# Custom Style Script

> Add custom JavaScript codes or styles to any page.

Canonical page: [https://chrome-stats.com/d/custom-style-script](https://chrome-stats.com/d/custom-style-script)

## Overview

- **ID:** `custom-style-script`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** Milen
- **Category:** web-development,privacy-security,other
- **Daily users:** 1,902
- **Weekly downloads:** 32
- **Rating:** 3.86 / 5 (73 ratings)
- **Version:** 0.1.8
- **Last updated:** 2026-06-15
- **First published:** 2015-07-09
- **Size:** 57 KB
- **Data as of:** 2026-09-15
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/custom-style-script/)
- **Website:** [https://mybrowseraddon.com/custom-style-script.html](https://mybrowseraddon.com/custom-style-script.html)

## Description

**Custom Style Script** is a powerful Chrome extension that empowers you to personalize the appearance and behavior of any webpage by injecting custom JavaScript or CSS codes. This extension allows you to add multiple code snippets either to specific URLs or across all pages, offering unparalleled flexibility.

Key features include a user-friendly toolbar icon to quickly enable or disable the extension, options to manage individual code items separately, and support for including external JS or CSS libraries like jQuery or Bootstrap. Its options page provides examples and detailed settings to help you validate and adjust your code effectively. Whether you want to tweak styles or enhance functionality, Custom Style Script makes it simple and efficient. For support and feature requests, visit the official homepage.

## Rankings

- #2,233 — Overall
- #243 — Web Development
- #353 — Other extensions
- #4 — style
- #8 — script
- #12 — customer

## Permissions and access

### Permissions

- `storage`
- `scripting`

### Host permissions

- `<all_urls>`

### Content script matches

- `<all_urls>`

## Safety

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

### Analysis details

- Allows access to all websites, posing a significant security risk as it can monitor and modify data from any visited site.
- 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).

## Review summary

Custom Style Script is appreciated for enabling users to add custom CSS styles and fix poorly designed websites, making them more usable without compromising privacy. However, multiple users report that the script injection feature fails, the add-on may stop working after a short time, and it sometimes does not function on specific sites or subdomains. While effective overall, improvements in the user interface and reliability could enhance the user experience.

### Pros

- Allows adding custom CSS styles to websites effectively.
- Enables fixing or improving poorly designed websites for better usability.
- Does not make unwanted network requests, ensuring user privacy.
- Facilitates customization and addition of missing features on websites.
- Simple and useful for site-specific modifications.

### Cons

- Script injection feature often does not work as expected.
- Some users report the add-on stops working after a short period.
- May not work on certain sites or subdomains (e.g., Amazon Prime Video).
- User interface could be improved for better user experience.

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