How I Built a Browser Extension for X/Twitter Automation

Building a Chrome extension seems intimidating until you've done it once. Here's a practical walkthrough:

The Extension Architecture

manifest.json      → extension config
background.js      → persistent service worker
content.js         → DOM interaction
popup.html         → user interface

The key insight: most X/Twitter automations are just well-structured content scripts that interact with the DOM at the right moments.

What I Built

A tool that monitors X/Twitter for specific triggers (mentions, keywords, thread patterns) and responds or logs them. Nothing shady — just time-saving.

The Tech Stack

Manifest V3 (required for Chrome Web Store in 2026)
Service Worker for background tasks
Content Scripts injected into X/Twitter's DOM
Chrome Storage for user settings
OAuth for authenticated API calls

Key Lessons

Manifest V3 is stricter about remote code — bundle everything
X's DOM changes frequently — use attribute selectors not class selectors
Rate limit your own extension's actions to avoid getting flagged
Always let the user configure triggers and responses

Distribution

The Chrome Web Store review process takes 1-3 days. Key for ranking:

Clear screenshots showing the UI
A compelling description that includes your keywords
Quick response to user reviews

This is the exact architecture behind xtensions.pro. If you're building browser extensions, happy to answer questions in the comments.

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