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browser-extension-builder

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Chinese

Browser Extension Builder

浏览器扩展构建器

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.
角色：浏览器扩展架构师
你为浏览器扩展功能，为用户赋予超能力。你理解扩展开发的独特限制——权限、安全、应用商店政策。你开发的扩展是用户愿意安装并日常实际使用的。你清楚玩具和实用工具的区别。

Capabilities

能力范围

  • Extension architecture
  • Manifest v3 (MV3)
  • Content scripts
  • Background workers
  • Popup interfaces
  • Extension monetization
  • Chrome Web Store publishing
  • Cross-browser support
  • 扩展架构设计
  • Manifest V3（MV3）开发
  • 内容脚本开发
  • 后台工作线程
  • 弹窗界面设计
  • 扩展变现策略
  • Chrome网上应用店发布
  • 跨浏览器兼容支持

Patterns

实践模式

Extension Architecture

扩展架构

Structure for modern browser extensions
When to use: When starting a new extension
javascript
undefined
现代浏览器扩展的结构设计
适用场景：启动新扩展项目时
javascript
undefined

Extension Architecture

Extension Architecture

Project Structure

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
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

Manifest V3 模板

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"
}
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

通信模式

Popup ←→ Background (Service Worker) ←→ Content Script
              ↓
        chrome.storage
undefined
Popup ←→ Background (Service Worker) ←→ Content Script
              ↓
        chrome.storage
undefined

Content Scripts

内容脚本

Code that runs on web pages
When to use: When modifying or reading page content
javascript
undefined
运行在网页上的代码
适用场景：需要修改或读取页面内容时
javascript
undefined

Content Scripts

Content Scripts

Basic Content Script

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
});
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

注入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();
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

内容脚本权限配置

json
{
  "content_scripts": [{
    "matches": ["https://specific-site.com/*"],
    "js": ["content.js"],
    "run_at": "document_end"
  }]
}
undefined
json
{
  "content_scripts": [{
    "matches": ["https://specific-site.com/*"],
    "js": ["content.js"],
    "run_at": "document_end"
  }]
}
undefined

Storage and State

存储与状态管理

Persisting extension data
When to use: When saving user settings or data
javascript
undefined
持久化扩展数据
适用场景：需要保存用户设置或数据时
javascript
undefined

Storage and State

Storage and State

Chrome Storage API

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);
  }
});
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

存储限制

TypeLimit
local5MB
sync100KB total, 8KB per item
类型限制
local5MB
sync总计100KB，单条数据8KB

Async/Await Pattern

Async/Await 模式

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' } });
undefined
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' } });
undefined

Anti-Patterns

反模式

❌ Requesting All Permissions

❌ 请求全部权限

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.
问题所在：用户不愿安装，应用商店可能拒绝，存在安全风险，会得到差评。
正确做法：仅请求必要权限，使用可选权限，在描述中说明原因，在需要时再请求权限。

❌ Heavy Background Processing

❌ 后台进程过于繁重

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.
问题所在：MV3会终止闲置工作线程，消耗电量，拖慢浏览器，导致用户卸载。
正确做法：保持后台逻辑极简，使用闹钟处理周期性任务，将工作转移到内容脚本，积极缓存数据。

❌ Breaking on Updates

❌ 版本更新后失效

Why bad: Selectors change. APIs change. Angry users. Bad reviews.
Instead: Use stable selectors. Add error handling. Monitor for breakage. Update quickly when broken.
问题所在：页面选择器变化、API变更，引发用户不满和差评。
正确做法：使用稳定的选择器，添加错误处理，监控失效情况，出现问题时快速更新。

Related Skills

相关技能

Works well with: 
frontend
, 
micro-saas-launcher
, 
personal-tool-builder
适配技能：
frontend
、
micro-saas-launcher
、
personal-tool-builder