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+---
+name: browser-extension-builder
+description: "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 ..."
+risk: unknown
+source: "vibeship-spawner-skills (Apache 2.0)"
+date_added: "2026-02-27"
+---
+
+# 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,
+  "name": "My Extension",
+  "version": "1.0.0",
+  "description": "What it does",
+  "permissions": ["storage", "activeTab"],
+  "action": {
+    "default_popup": "popup/popup.html",
+    "default_icon": {
+      "16": "icons/icon16.png",
+      "48": "icons/icon48.png",
+      "128": "icons/icon128.png"
+    }
+  },
+  "content_scripts": [{
+    "matches": ["<all_urls>"],
+    "js": ["content/content.js"]
+  }],
+  "background": {
+    "service_worker": "background/service-worker.js"
+  },
+  "options_page": "options/options.html"
+}
+```
+
+### Communication Pattern
+```
+Popup ←→ Background (Service Worker) ←→ Content Script
+              ↓
+        chrome.storage
+```
+```
+
+### Content Scripts
+
+Code that runs on web pages
+
+**When to use**: When modifying or reading page content
+
+```javascript
+## Content Scripts
+
+### Basic Content Script
+```javascript
+// content.js - Runs on every matched page
+
+// Wait for page to load
+document.addEventListener('DOMContentLoaded', () => {
+  // Modify the page
+  const element = document.querySelector('.target');
+  if (element) {
+    element.style.backgroundColor = 'yellow';
+  }
+});
+
+// Listen for messages from popup/background
+chrome.runtime.onMessage.addListener((message, sender, sendResponse) => {
+  if (message.action === 'getData') {
+    const data = document.querySelector('.data')?.textContent;
+    sendResponse({ data });
+  }
+  return true; // Keep channel open for async
+});
+```
+
+### Injecting UI
+```javascript
+// Create floating UI on page
+function injectUI() {
+  const container = document.createElement('div');
+  container.id = 'my-extension-ui';
+  container.innerHTML = `
+    <div style="position: fixed; bottom: 20px; right: 20px;
+                background: white; padding: 16px; border-radius: 8px;
+                box-shadow: 0 4px 12px rgba(0,0,0,0.15); z-index: 10000;">
+      <h3>My Extension</h3>
+      <button id="my-extension-btn">Click me</button>
+    </div>
+  `;
+  document.body.appendChild(container);
+
+  document.getElementById('my-extension-btn').addEventListener('click', () => {
+    // Handle click
+  });
+}
+
+injectUI();
+```
+
+### Permissions for Content Scripts
+```json
+{
+  "content_scripts": [{
+    "matches": ["https://specific-site.com/*"],
+    "js": ["content.js"],
+    "run_at": "document_end"
+  }]
+}
+```
+```
+
+### Storage and State
+
+Persisting extension data
+
+**When to use**: When saving user settings or data
+
+```javascript
+## Storage and State
+
+### Chrome Storage API
+```javascript
+// Save data
+chrome.storage.local.set({ key: 'value' }, () => {
+  console.log('Saved');
+});
+
+// Get data
+chrome.storage.local.get(['key'], (result) => {
+  console.log(result.key);
+});
+
+// Sync storage (syncs across devices)
+chrome.storage.sync.set({ setting: true });
+
+// Watch for changes
+chrome.storage.onChanged.addListener((changes, area) => {
+  if (changes.key) {
+    console.log('key changed:', changes.key.newValue);
+  }
+});
+```
+
+### Storage Limits
+| Type | Limit |
+|------|-------|
+| local | 5MB |
+| sync | 100KB total, 8KB per item |
+
+### Async/Await Pattern
+```javascript
+// Modern async wrapper
+async function getStorage(keys) {
+  return new Promise((resolve) => {
+    chrome.storage.local.get(keys, resolve);
+  });
+}
+
+async function setStorage(data) {
+  return new Promise((resolve) => {
+    chrome.storage.local.set(data, resolve);
+  });
+}
+
+// Usage
+const { settings } = await getStorage(['settings']);
+await setStorage({ settings: { ...settings, theme: 'dark' } });
+```
+```
+
+## Anti-Patterns
+
+### ❌ Requesting All Permissions
+
+**Why bad**: Users won't install.
+Store may reject.
+Security risk.
+Bad reviews.
+
+**Instead**: Request minimum needed.
+Use optional permissions.
+Explain why in description.
+Request at time of use.
+
+### ❌ Heavy Background Processing
+
+**Why bad**: MV3 terminates idle workers.
+Battery drain.
+Browser slows down.
+Users uninstall.
+
+**Instead**: Keep background minimal.
+Use alarms for periodic tasks.
+Offload to content scripts.
+Cache aggressively.
+
+### ❌ Breaking on Updates
+
+**Why bad**: Selectors change.
+APIs change.
+Angry users.
+Bad reviews.
+
+**Instead**: Use stable selectors.
+Add error handling.
+Monitor for breakage.
+Update quickly when broken.
+
+## Related Skills
+
+Works well with: `frontend`, `micro-saas-launcher`, `personal-tool-builder`
+
+## When to Use
+This skill is applicable to execute the workflow or actions described in the overview.