Nex Reply ai Ext

The problem

Building a Chrome extension from scratch often means wrestling with Manifest V3 boilerplate, content script injection, and API security. Developers frequently waste days just getting a "no-build" vanilla JS environment to play nice with social media and email DOM selectors.

What it does

• Generates a complete Manifest V3 extension ready to load via 'Load unpacked' in Chrome.
• Provides native integration modules for Gmail, Outlook, LinkedIn, and X (Twitter).
• Implements secure client-side storage for user-provided API keys using XOR-obfuscation.
• Includes a zero-build dev loop using vanilla JS, HTML, and CSS for instant feedback.
• Features background script handling for direct Claude API calls without a middle-tier server.

Frameworks & tools

Chrome Extension Manifest V3, Vanilla JavaScript, Claude API, Chrome Storage API, HTML5, CSS3.

Why this beats prompting it yourself

Prompting usually results in disconnected snippets or broken manifest files. This skill delivers a production-hardened codebase that has actually shipped, including the complex DOM selectors needed to inject UI elements into dynamic web apps like Gmail and LinkedIn.

Use cases

• Deploy a private AI assistant for your team to use across email and social media.
• Fork a working MV3 template to build a custom "action-on-click" browser tool.
• Learn how to handle API calls and key storage in an extension without a backend.
• Rapidly prototype browser-based AI features without setting up Webpack or Vite.

Known limitations

This skill uses a vanilla JS pattern and is not compatible with React, Vue, or modern bundlers. API key obfuscation is for tamper-resistance, not enterprise-grade encryption.