How does it handle CSS conflicts on host pages?

The skill recommends using Shadow DOM or unique CSS prefixing to ensure that extension styles do not leak into or disrupt the host website's layout.

Can it handle navigation in Single Page Applications (SPAs)?

Absolutely. It utilizes idempotent injection patterns and MutationObservers to ensure your UI elements remain stable even as the page content swaps dynamically.

Is the performance of the host page protected?

Yes, the skill enforces best practices such as throttling observers with requestAnimationFrame and using non-blocking event handlers to keep the main thread free.

Does this skill support Chrome Manifest V3?

Yes, it is specifically designed around MV3 standards, focusing on service worker messaging and the modern security constraints of content scripts.

Content Script Developer

Name: Content Script Developer
Author: shipshitdev

byshipshitdev

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Browser Automation

Develops high-performance, Manifest V3-compliant browser extension content scripts with stable DOM integration and scoped styling.

The Content Script Developer skill provides expert guidance for building reliable browser extension components that interact seamlessly with third-party websites. It focuses on the specific technical challenges of Chrome MV3, including isolated worlds, idempotent UI injection, and performance optimization for dynamic Single Page Applications (SPAs). By utilizing patterns like Shadow DOM for style isolation and throttled MutationObservers for monitoring DOM changes, this skill ensures that your extensions are robust, accessible, and low-impact on host page performance.

Key Features

0110 GitHub stars

02Throttled MutationObservers for efficient DOM tracking

03Manifest V3-compliant background messaging patterns

04Scoped styling using Shadow DOM and unique prefixes

05Idempotent UI injection for dynamic web environments

06Accessibility-first UI design for injected elements

Use Cases

01Building browser-based productivity tools with persistent storage

02Scraping dynamic data from complex Single Page Applications

03Injecting custom UI controls into third-party dashboards

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add shipshitdev/library content-script-developer

For use in Claude.ai and ChatGPT

Download Skill