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Browser Extension Reverse

ASecurity

Use for authorized reverse engineering of browser extensions (Chrome/Firefox) including manifest analysis, background workers, and extension-based credential or traffic logic recovery.

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  • Added September 23, 2026
ai-agents

Works with

  • mcp

Security analysis

A100/100

Pro scans all 2 files and shows the line behind each finding

Scanned September 23, 2026

npx -y skills add coco-research/coco --skill browser-extension-reverse --agent claude-code

Installs into .claude/skills of the current project.

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SKILL.md
---
name: browser-extension-reverse
description: Use for authorized reverse engineering of browser extensions (Chrome/Firefox) including manifest analysis, background workers, and extension-based credential or traffic logic recovery.
user-invocable: true
---

# Browser Extension Reverse Engineering

## 适用场景

- Chrome/Edge MV2/MV3 扩展分析
- Firefox 扩展
- 恶意扩展 IOC、供应链扩展投毒调查
- 扩展实现的签名/加密/代理逻辑还原

## 工作流

### 1. 包体

```text
□ crx 解压 / 从 profile 取扩展目录
□ manifest.json:permissions、host_permissions、background、content_scripts
□ 评估过度权限(<all_urls>、webRequest、debugger)
```

### 2. 逻辑

```text
□ service_worker / background 入口
□ content_script 注入点与世界(isolated)
□ chrome.storage / IndexedDB 密钥
□ 与 `js-reverse` 相同:Observe 网络与消息传递(runtime.sendMessage)
```

### 3. 动态

```text
□ 开发者模式加载解压目录
□ chrome://extensions 检查错误
□ DevTools 附加 service worker
□ 必要时 Frida/浏览器 CDP(jshookmcp)
```

## 工具链

| 工具 | 用途 |
|------|------|
| 解压/jq | manifest |
| Chrome DevTools | worker 调试 |
| js-reverse 工具链 | 深度 JS |
| YARA | 恶意扩展规则 |

## 参考

- `references/extension-analysis.md`
- `../js-reverse/` `../malware-analysis/`

Files in this skill

  • SKILL.md1.4 KB
  • references/extension-analysis.md328 B

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