Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx agentmods add skills/saprophytic-seattle561/reverse-skill/browser-extension-reversenpx skills add Saprophytic-seattle561/reverse-skill --skill browser-extension-reversegit clone --depth 1 https://github.com/Saprophytic-seattle561/reverse-skillWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/saprophytic-seattle561/reverse-skill/browser-extension-reverse)<a href="https://agentmods.dev/skills/saprophytic-seattle561/reverse-skill/browser-extension-reverse"><img src="https://agentmods.dev/badge/skills/saprophytic-seattle561/reverse-skill/browser-extension-reverse.svg" alt="Measured on agentmods" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00034 | $0.00571 |
| Opus 5 | $0.00017 | $0.00285 |
| Sonnet 5 | $0.00007 | $0.00114 |
| Haiku 4.5 | $0.00003 | $0.00057 |
Grade A, and why
browser-extension-reverse scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 5d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
This is a copy
100% identical to browser-extension-reverse — 0 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.
What it actually says
Browser Extension Reverse Engineering
ACTION REQUIRED（读完后立刻执行）
NOW: 读取../field-journal/precedent-reverse.mdNOW: 确认目标是浏览器扩展（crx/xpi/解压目录），不是普通网页 JS（普通 →js-reverse/）NEXT: 解压扩展；读 manifestACT: 权限面 → 后台脚本 → 网络/存储钩子
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
□ 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
□ 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
□ 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- field-journal 扩展恢复相关条目
../js-reverse/../malware-analysis/
路由上下文
上游: MASTER R30
下游: 复杂混淆 JS → js-reverse；投毒调查 → supply-chain / malware
任务完成自检
- 是否列出权限面与入口脚本？
- 是否还原关键数据流？
- Checklist？
What ships with it
1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 5d ago First seen · 74 lines · 34 tokens per session scan A 908c0bbcd53c
browser-extension-reverse is a skill published in the GitHub repository Saprophytic-seattle561/reverse-skill (1 stars, last pushed 2d ago), licensed MIT. It adds 34 tokens to every session and 571 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. It is 100% identical to browser-extension-reverse, differing in 0 lines, and is treated as a copy.
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