# Sakura - Custom JS & CSS

> User script manager that lets you inject your own JavaScript and CSS into websites matching URL patterns you define.

Canonical page: [https://chrome-stats.com/d/sakura-custom-js-css](https://chrome-stats.com/d/sakura-custom-js-css)

## Overview

- **ID:** `sakura-custom-js-css`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** Gidarai
- **Category:** web-development,appearance
- **Daily users:** 2
- **Weekly downloads:** 1
- **Version:** 1.0.0
- **Last updated:** 2025-12-05
- **First published:** 2025-12-02
- **Size:** 2.58 MB
- **Data as of:** 2026-09-25
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/sakura-custom-js-css/)

## Description

Sakura lets you inject your own JavaScript and CSS into any website, using rules you define.
Easily create, enable, disable, import, or export your custom scripts.

This extension operates entirely on your device.
All rules, scripts, and settings are stored locally using storage.local.
No data is sent anywhere.

Features:
• Custom JavaScript and CSS per URL pattern
• User-friendly Sakura-themed editor with CodeMirror
• Rule search, enable/disable toggles, and live updates
• Import and export rules as JSON
• No remote requests, no external servers, no telemetry
• All data stays on your device

Sakura is a local developer / power-user tool.
It does not collect, transmit, or analyze any personal data.

## Rankings

- #64,422 — Overall
- #224 — custom feed
- #227 — custom font

## Permissions and access

### Permissions

- `storage`
- `<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).

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Source: [Chrome-Stats](https://chrome-stats.com/d/sakura-custom-js-css)