# User JavaScript and CSS

> User JavaScript and CSS on any website

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

## Overview

- **ID:** `user-js-and-css`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** tenRabbits
- **Category:** web-development,appearance
- **Daily users:** 89
- **Weekly downloads:** 12
- **Rating:** 5.00 / 5 (1 ratings)
- **Version:** 3.1.3
- **Last updated:** 2026-03-16
- **First published:** 2026-03-13
- **Size:** 2.33 MB
- **Data as of:** 2026-09-14
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/user-js-and-css/)

## Description

Свои JavaScript и CSS на любом сайте

Userscript и userstyle — расширение позволяет запускать собственные скрипты и стили оформления на любых сайтах. JavaScript и CSS подключаются мгновенно, еще до загрузки страницы, поэтому результат выходит без задержек.

Преимущества:
- Мгновенный запуск
- Возможность добавлять свои библиотеки
- Система URL масок позволяет гибко изменять список сайтов к которым будут применены изменения

Документация:
<a href="https://prod.outgoing.prod.webservices.mozgcp.net/v1/678806d0e19d07fe07f4ec68d8e9116280cc63610f663e5dc639ac7f5707c679/https%3A//tenrabbits.github.io/user-js-css-docs/ru/" rel="nofollow">https://tenrabbits.github.io/user-js-css-docs/ru/</a>

## Rankings

- #12,425 — Overall
- #38 — javascript
- #220 — script

## Permissions and access

### Permissions

- `alarms`
- `storage`
- `tabs`
- `unlimitedStorage`
- `scripting`

### Host permissions

- `http://*/`
- `https://*/`

### Content script matches

- `*`

## 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

- [Custom Style Script](https://chrome-stats.com/d/custom-style-script) — 1,935 users, 3.86 / 5
- [User Scripts Manager](https://chrome-stats.com/d/scripts-manager) — 1 users
- [Script for Me](https://chrome-stats.com/d/script-for-me) — 29 users
- [User Script Loader](https://chrome-stats.com/d/userscript) — 14 users
- [User Script Loader](https://chrome-stats.com/d/user-script-loader) — 14 users
- [UserScript Pro: Custom JS & CSS](https://chrome-stats.com/d/userscript-pro-custom-js-css) — 3 users, 5.00 / 5
- [Style Engine – Custom CSS & JavaScript](https://chrome-stats.com/d/style-engine) — 4 users
- [JS Injector Code](https://chrome-stats.com/d/js-injector-code) — 1 users
- [User JavaScript and CSS KL](https://chrome-stats.com/d/user-javascript-and-css-kl) — 120 users, 4.00 / 5
- [Magic Userscript+](https://chrome-stats.com/d/userscript-plus) — 707 users, 4.32 / 5
- [Custom Site JS](https://chrome-stats.com/d/custom-site-js) — 232 users, 4.57 / 5
- [OkTools - расширение для ok.ru](https://chrome-stats.com/d/oktools) — 677 users, 4.09 / 5

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