Winner of Best Pitch @ Go On Hacks 2025

LeReplacer - Chrome Extension

A Chrome extension that automatically detects and replaces images containing faces with LeBron James images, includes hand tracking camera controls, and features a caption generator for social media posts. Made because WE NEED TO SEE MORE LEBRON IN OUR INTERNET.

YouTube demo

Inspiration:

Scrolling Instagram and getting tired of the same people over and over again? You need some LEBRON LeReplacer is a Chrome extension that will find faces, slap a LeBron on them, and make your internet 67% better.

Features

Image Replacement

• Face Detection: Uses Chrome's native Shape Detection API (Face Detection) for ultra-fast face detection
• Smart Replacement: Only replaces images containing faces with LeBron James images
• Dynamic Detection: Uses MutationObserver to catch images added during infinite scroll
• Fade to LeBron: Replaces every single image to LeBon

Camera & Hand Tracking (Mini Game)

• Hand Detection: Real-time hand tracking using Handtrack.js
• Stroke Detection: Detects hand stroking motion (up/down movements)
• Progress Meter: Visual progress bar that fills as you complete strokes

Caption Generator (Twitter Bot)

• Generate Captions: Creates weird captions using Gemini API
• Auto-Post to Twitter/X: Automatically posts generated captions
• Link to Twitter bot: The twitter bot is https://x.com/Lebronsmygoat_

Installation

Option 1: Install from Zip File (For Sharing)

If you received this extension as a .zip file, follow these steps:

1. Download the zip file (e.g., my-extension.zip)

2. Extract the zip file:

   • Windows: Right-click the zip file → "Extract All..." → Choose a location
   • Mac: Double-click the zip file (it will extract automatically)
   • Linux: Right-click → "Extract Here" or use unzip my-extension.zip

3. Open Chrome/Edge and navigate to:

   chrome://extensions/
   

   Or in Edge:

   edge://extensions/
   

4. Enable Developer Mode:

   • Toggle the "Developer mode" switch in the top-right corner of the extensions page

5. Load the Extension:

   • Click the "Load unpacked" button
   • Navigate to the extracted folder (the folder that contains manifest.json)
   • Select the folder and click "Select Folder" (or "Open" on Mac)

6. Verify Installation:

   • The extension should appear in your extensions list
   • The extension icon should appear in your browser toolbar
   • If you see any errors, check the console for details