Browser Extension Developer
Build and maintain cross-browser extensions for Chrome, Firefox, and Edge.
Installation
- Make sure Claude is on your device and in your terminal.
Skills load from
~/.claude/skills/when Claude Code starts up — so you need it on your machine first. If you don't have it yet, install it once with the command below, then runclaudein any terminal to verify.One-time setupnpm i -g @anthropic-ai/claude-codeAlready have it? Skip ahead.
- Paste into Claude Code or into your terminal.
This copies the whole skill folder into
~/.claude/skills/browser-extension-developer-yamadashy/— the SKILL.md plus any scripts, reference docs, or templates the skill ships with. Safe default: works for every skill.Faster alternative (instruction-only skills)
Skips the clone and grabs only the SKILL.md file. Don't use this if the skill ships Python scripts, reference markdowns, or asset templates — they won't be downloaded and the skill will fail when it tries to load them.
Quick install (SKILL.md only)Sign up to copy - Restart Claude Code.
Quit and reopen Claude Code (or any other agent that loads from
~/.claude/skills/). New skills are picked up on startup. - Just ask Claude.
Skills auto-activate when your request matches the skill's description — no slash command needed. Trigger phrases live in the skill's own frontmatter; you can read them in the “What this skill does” section above.
Prefer to read the source first? Open on GitHub.
When Claude uses it
Use this skill when developing or maintaining browser extension code in the `browser/` directory, including Chrome/Firefox/Edge compatibility, content scripts, background scripts, or i18n updates.
What this skill does
Browser Extension Developer
Cross-browser extension (Chrome/Firefox/Edge) using WXT framework with Manifest V3. Injects "Repomix" button into GitHub repository pages.
Structure
browser/
├── entrypoints/ # background.ts, content.ts
├── public/_locales/ # i18n (12 languages)
├── wxt.config.ts # WXT configuration
└── .output/ # Built files (chrome-mv3, firefox-mv2)
Commands
npm run dev- Development mode (Chrome default)npm run dev:firefox- Firefox dev modenpm run build-all- Build all browsersnpm run lint/npm run test
i18n
12 languages: en, ja, de, fr, es, pt_BR, id, vi, ko, zh_CN, zh_TW, hi
New language: Create public/_locales/[code]/messages.json with keys: appDescription, openWithRepomix
Notes
- Chrome/Edge use
chrome.*APIs, Firefox may need polyfills - Run lint and tests before completion
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