MultiLangSwitcher

English | 简体中文

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Project Overview

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MultiLangSwitcher is a Chromium-based browser extension that helps users quickly switch the Accept-Language HTTP request header sent by the browser. Users can also customize the full Accept-Language string on the debugging tools page.

The extension utilizes the chrome.declarativeNetRequest API to modify the request header, ensuring performance and privacy.

Note: This extension is not suitable for websites that determine language based on IP address.

The website's layout and styling are built with Bootstrap.

If the built-in request header detection fails or returns no results, you can manually navigate to BrowserScan or header-echo for further verification.

If you need to switch the browser UA, you can take a look at this project: User-Agent Switcher and Manager

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Additionally, you can configure browser language settings as shown to confuse simple navigator.languages detection (though this will increase the uniqueness of your browser fingerprint).

This is a demonstration of customizing the Accept-Language string.

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Features

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• Language Request Header Switching: Popup interface for selecting languages and modifying Accept-Language request headers
• Domain-Based Auto-Switching: Automatically applies corresponding language settings based on visited domains
  • Supports top-level domains (e.g., .cn, .jp) and second-level domains (e.g., com.cn, co.jp)
  • Built-in domain rules covering major countries and regions
  • Defaults to English for unmatched domains
• Persistent Settings: Language preferences and auto-switch status saved to local storage
• Efficient Header Modification: Uses chrome.declarativeNetRequest API for better performance than the WebRequest API
• Background Auto-Application: Extension automatically loads settings on startup with error retry mechanism
• Theme Switching: Support for light/dark theme switching
• Update Checker: Automatically checks GitHub Releases for the latest version information
• Reset Function: One-click reset of the Accept-Language request header
• Detection Page: detect.html for verifying request header modifications, which detects:
  • Accept-Language request headers
  • JavaScript language preferences (navigator.language, navigator.languages)
  • Internationalization API (Intl) information
  • WebRTC local IP leakage
  • Canvas, WebGL, and AudioContext fingerprinting information
• Debugging Tools: debug.html provides debugging and diagnostic features, including:
  • View declarativeNetRequest dynamic rule details
  • Multi-endpoint request header testing
  • Custom Accept-Language strings (e.g., en-US,en;q=0.9,zh-CN;q=0.8)
  • Real-time log display with category filtering
  • Rule priority fixes and rule rebuilding
  • Extension diagnostic information (version, permissions, configuration, storage status)
  • Domain-language mapping rules viewer
  • Reset Accept-Language request header

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Installation Guide

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Install from Chrome Web Store / Microsoft Edge Extensions Home (Not Published)

Currently, only installation from source code is supported.

Note: This extension has not been published to the Chrome Web Store due to the developer not registering a Google developer account.

Install from Source Code

1. Download or Clone the Code: Clone the project repository to your local computer (Or download the ZIP from the release and unzip it)

   git clone https://github.com/ChuwuYo/MultiLangSwitcher.git

2. Open Browser Extensions Management: Enter chrome://extensions/ / edge://extensions/ in the Chrome browser address bar and press Enter to go to the Extensions management page.

3. Enable Developer Mode: Turn on the "Developer mode" switch in the top right corner of the page.

4. Load Unpacked Extension: Click the "Load unpacked" button in the top left corner of the page and select the MultiLangSwitcher project folder you downloaded.

5. Complete: The extension will be successfully added to the browser, and you can start using it.

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Usage

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1. Open the Extension Popup: Click the MultiLangSwitcher extension icon in the browser toolbar.
2. Select Preferred Language: In the popup dropdown menu, select the language you want the browser to simulate.
3. Apply Settings: Click the "Apply Changes" button at the bottom of the interface. Your settings will be saved and immediately applied to new network requests.
4. Verification and Debugging: Click the "Detection Page" or "Debugging Tools" links provided in the popup to verify if the language settings are effective, or to diagnose issues when they occur.

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Thanks to Contributors (Welcome to Submit PRs)

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License

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