# Async CSS

> Makes webpages load faster by allowing them to load before the external CSS files are loaded.

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

## Overview

- **ID:** `async-css`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** em\_te
- **Category:** appearance,other
- **Daily users:** 7
- **Rating:** 4.00 / 5 (10 ratings)
- **Version:** 0.2.6
- **Last updated:** 2019-09-03
- **First published:** 2018-07-25
- **Size:** 37 KB
- **Data as of:** 2026-09-06
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/async-css/)

## Description

Async CSS is a Firefox add-on designed to enhance webpage loading speed by allowing webpages to load before external CSS files. With this add-on, the browser displays the HTML first without any CSS styles, and then applies the CSS styles dynamically as they are downloaded. Say goodbye to slow-loading webpages and enjoy a faster Internet experience!

## Rankings

- #37,678 — Overall
- #103 — sync

## Permissions and access

### Permissions

- `<all_urls>`
- `webRequest`
- `webRequestBlocking`
- `storage`

## Safety

- **Risk impact:** Moderate risk impact
- **Risk likelihood:** Low 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/async-css)