How to Install LeetCode Solver Extension in Chrome

After I published my LeetCode AI Solver Chrome Extension, I received several questions about how to install and use it correctly.
To make things simple, this article provides a clear, step-by-step guide to get the extension up and running.

Step 1: Download the Extension Source Code

First, go to the GitHub repository:

👉 https://github.com/nirajang20/LeetCode-Solver

You can get the code in either of these ways:

• Download ZIP from GitHub, or
• Clone the repository using Git

Important (ZIP users)

• If you downloaded the ZIP file, extract the ZIP file first
• After extraction, you should have a folder (for example: LeetCode-Solver)
• Save this folder in a safe and permanent location on your computer

⚠️ Do not delete, rename, or move this folder later.
Chrome will disable the extension if the folder location changes.

Step 2: Load the Extension in Chrome

1. Open Google Chrome
2. Go to:

chrome://extensions/

3. Turn ON Developer mode (toggle at the top-right corner)
4. Click Load unpacked (top-left)
5. Select the extracted extension folder (not the ZIP file)
6. Click Select Folder

If everything is correct, the extension will now appear in your extensions list.

Step 3: Create a Gemini API Key

The extension uses Google Gemini AI, so you need to create your own API key.

1. Go to: 👉 https://aistudio.google.com/api-keys
2. Create a new API key
3. Copy the generated key

Step 4: Configure the Extension

1. Click the Extensions icon in Chrome
2. Find LeetCode Solver
3. Click Open options
4. Paste your Gemini API key
5. Click Save

Note:
Your API key stays on-device inside Chrome extension storage.
Always use your own Gemini key to avoid sharing access with anyone else.

Step 5: Use the Extension on LeetCode

1. Go to: 👉 https://leetcode.com/problemset/
2. Open any problem
3. You will see a “Solve using AI” button at the top-right, next to the Submit button
4. Click Solve using AI

⚠️ Important:
Make sure the default function signature in the LeetCode code editor is unchanged.
The AI relies on this function template to generate the correct solution.

Final Notes

• The extension runs entirely inside your browser
• No external servers are used for storing your API key
• Best results come from keeping the original LeetCode function template intact

If you have issues or suggestions, feel free to open an issue on GitHub.

Happy coding 🚀