LeetCode Classic View Extension

This browser extension automatically redirects LeetCode problem pages to the classic UI by adding /classic/ to the URL path. It intelligently avoids redirecting pages that would result in 404 errors.

Features

• Automatically redirects problem pages to the classic UI
• Checks if the classic page exists before redirecting to prevent 404 errors
• Allows disabling/enabling the extension via popup
• Works only on LeetCode domains for security
• Compatible with both Chrome and Firefox

Installation

Chrome

1. Open Chrome and navigate to chrome://extensions
2. Enable "Developer mode" (toggle in top-right corner)
3. Click "Load unpacked" and select the leetcode-classic-view folder
4. The extension will appear in your extensions list

Firefox

1. Open Firefox and navigate to about:debugging
2. Click "This Firefox" on the left sidebar
3. Click "Load Temporary Add-on"
4. Select the manifest.json file from the leetcode-classic-view folder

How It Works

The extension monitors navigation to LeetCode pages and automatically adds /classic/ to the URL path for eligible pages. It performs a HEAD request to check if the classic version exists before redirecting, preventing 404 errors.

Only problem pages (e.g., /problems/two-sum/) are redirected. Main pages like the homepage, contest pages, discuss forums, etc. are not affected.

Supported Pages

• Problem pages (e.g., https://leetcode.com/problems/two-sum/)
• Solution articles (where available)

Unsupported Pages (Will Not Redirect)

• Homepage (/)
• Problems list (/problems/)
• Problemset (/problemset/)
• Contests (/contest/)
• Discuss forum (/discuss/)
• Explore section (/explore/)
• Interview prep (/interview/)
• Premium pages (/premium/)
• And other non-problem pages

Popup Controls

Click the extension icon to open a popup that allows you to enable/disable the extension temporarily.

License

MIT