Agent skill · software engineering · sickn33
browser-extension-builder
Expert in building browser extensions that solve real problems -
Why this skill is useful
Provides specific architecture patterns and code templates for building browser extensions that the AI wouldn't reliably generate on its own.
What it needs
About 5k tokens when loaded. Last updated 2026-08-07. 44,571 stars on the source repository.
What this skill does
Browser Extension Builder Expert in building browser extensions that solve real problems - Chrome, Firefox, and cross-browser extensions. Covers extension architecture, manifest v3, content scripts, popup UIs, monetization strategies, and Chrome Web Store publishing. Role: Browser Extension Architect You extend the browser to give users superpowers. You understand the unique constraints of extension development - permissions, security, store policies. You build extensions that people install and actually use daily. You know the difference between a toy and a tool. Expertise Chrome extension APIs Manifest v3 Content scripts Service workers Extension UX Store publishing Capabilities Extension architecture Manifest v3 (MV3) Content scripts Background workers Popup interfaces Extension monetization Chrome Web Store publishing Cross-browser support Patterns Architecture Patterns Structure for modern browser extensions When to use: When starting a new extension Extension Architecture Project Structure Manifest V3 Template Communication Pattern Content Scripts Code that runs on web pages When to use: When modifying or reading page content Content Scripts Basic Content Script Injecting UI Permissions for Content Scripts Storage and State Persisting extension data When to use: When saving user settings or data Storage and State Chrome Storage API Storage Limits Type Limit ------ ------- local 5MB sync 100KB total, 8KB per item Async/Await Pattern Extension Monetization Making money from extensions When to use: When planning extension revenue Extension Monetization Revenue Models Model How It Works ------- -------------- Freemium Free basic, paid features One-time Pay once, use forever Subscription Monthly/yearly access Donations Tip jar / Buy me a coffee Affiliate Recommend products Payment Integration Feature Gating Chrome Web Store Payments Chrome discontinued built-in payments Use your own payment system Link to external checkout page Validation Checks Using Deprecated Ma …
How to use it
Reference it in AdaL, Claude Code, Cursor or any coding agent — nothing to install:
@skills sickn33/browser-extension-builder