AI-powered Chrome extension that auto-negotiates marketplace listings on Facebook Marketplace using Gemini.

Features

• Capture target price & reasoning when creating listings
• Auto-generate negotiation replies using LLM based on seller constraints
• Manage active negotiations in side panel dashboard
• Approve/edit replies before sending

Tech Stack

• Chrome Extension MV3 + Plasmo
• React 18 + TypeScript
• Chrome Storage API
• Gemini 2.0 Flash (free model)
• Node.js/Express (optional proxy server)

Setup

1. cd my-extension && npm install && npm run dev
2. Go to chrome://extensions → Enable Developer mode → Load unpacked → select .plasmo/ folder
3. Open Facebook Marketplace, create listing or add target price in extension side panel
4. Extension injects negotiation UI into marketplace pages and side panel

Files

• sidepanel.tsx — listing management & negotiation controls
• src/content/content.js — FB Marketplace DOM injection
• lib/llm.ts — Gemini integration & prompt building
• src/background/index.ts — message routing
• src/options/options.html — API key configuration