browser-extension-builder SKILL.md skillA
browser-extension-builder from aicodedecode/awesome-muse-skills is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add aicodedecode/awesome-muse-skills/browser-extension-builder@git:20260927.806f3e1Pins git:20260927.806f3e1 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- aicodedecode/awesome-muse-skills
- Path
skills-imported/browser-extension-builder/SKILL.md- Versions recorded
- 1
- Latest version
- git:20260927.806f3e1, committed Sep 27, 2026
- Size
- 5,977 bytes
- Repository stars
- 25
- License
- MIT
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. Use when: browser extension, chrome extension, firefox addon, extension, manifest v3.
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# Browser Extension Builder
**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.
## Capabilities
- Extension architecture
- Manifest v3 (MV3)
- Content scripts
- Background workers
- Popup interfaces
- Extension monetization
- Chrome Web Store publishing
- Cross-browser support
## Patterns
### Extension Architecture
Structure for modern browser extensions
**When to use**: When starting a new extension
```javascript
## Extension Architecture
### Project Structure
```
extension/
├── manifest.json # Extension config
├── popup/
│ ├── popup.html # Popup UI
│ ├── popup.css
│ └── popup.js
├── content/
│ └── content.js # Runs on web pages
├── background/
│ └── service-worker.js # Background logic
├── options/
│ ├── options.html # Settings page
│ └── options.js
└── icons/
├── icon16.png
├── icon48.png
└── icon128.png
```
### Manifest V3 Template
```json
{
"manifest_version": 3,
…Read the whole file at its exact version.
How to install
mdr add aicodedecode/awesome-muse-skills/browser-extension-builder@sha256:7bc401a7f3074184The line at the top of this page pins the label git:20260927.806f3e1, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_baz7ffud7g6xdiy7)
2 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 1 version of this file, committed on Sep 27, 2026.
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (5977 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
aicodedecode/awesome-muse-skills · 25 stars · license MIT · pushed 2026-10-10 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_baz7ffud7g6xdiy7 GET https://markdownregistry.com/api/v1/resolve?ref=aicodedecode/awesome-muse-skills/browser-extension-builder GET https://markdownregistry.com/api/v1/blob/7bc401a7f30741844b7c08b60b5f37aabb8b9e881880c254de951ca85ed7b733
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.