# Replace Google CDN

> Replace Google CDN with USTC CDN.

Canonical page: [https://chrome-stats.com/d/replace-google-cdn](https://chrome-stats.com/d/replace-google-cdn)

## Overview

- **ID:** `replace-google-cdn`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** DeBao.Wu
- **Category:** other
- **Daily users:** 587
- **Weekly downloads:** 40
- **Rating:** 4.86 / 5 (29 ratings)
- **Version:** 0.3.1resigned1
- **Last updated:** 2024-04-25
- **First published:** 2016-03-14
- **Size:** 51 KB
- **Data as of:** 2026-09-07
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/replace-google-cdn/)

## Description

The Replace Google CDN Chrome extension substitutes Google CDN URLs with the University of Science and Technology of China's (USTC) CDN addresses for websites using Google CDN APIs. This helps accelerate website loading and access, particularly for users in China, by directing requests through USTC's faster domestic network. For example, it replaces ajax.googleapis.com with USTC's CDN to speed up sites like StackOverflow.

This extension is especially useful for developers or users frequently accessing sites reliant on Google CDN resources and seeking improved loading times within regions where Google's CDN is slower or restricted. Originally developed by the author at [justjavac](https://github.com/justjavac), this tool seamlessly ensures a better browsing experience through smart CDN URL replacements.

## Rankings

- #4,555 — Overall
- #70 — replace
- #118 — replay
- #197 — reply

## Permissions and access

### Permissions

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

## 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).

## Review summary

Replace Google CDN Firefox add-on is praised for improving loading speeds and enabling access to many websites that struggle to load under normal conditions, especially in mainland China. Users appreciate its simplicity and effectiveness in bypassing Google CDN restrictions. However, some users report display problems on certain webpages and the need to manually adjust advanced browser settings, which can be complicated. It also has limitations with CAPTCHA verification pages. Overall, it is considered a very useful tool with some configuration and compatibility caveats.

### Pros

- Effectively improves website loading speed, especially for accessing foreign sites from mainland China.
- Solves loading issues for many websites that otherwise fail to load properly.
- Simple and small extension with significant utility.
- Helps bypass Google CDN to enable better connectivity in restricted regions.

### Cons

- Causes layout and display issues on certain websites like Google Flutter Chinese documentation.
- Requires manual configuration changes in Firefox about:config to function fully, which may be complex for some users.
- Does not work properly with CAPTCHA pages on some sites.

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