Individual skill

web-extension-reverse

Reverse engineer browser extensions (Chrome/Edge MV2/MV3, Firefox) for an authorized review: unpack .crx/.xpi, assess the permission surface, trace background/service-worker and content-script logic, and recover credential, signing, or traffic-handling behavior. Load on "analyze this extension", extension supply-chain or malicious-extension investigation, or keys hidden in chrome.storage. Signals: .crx, .xpi, manifest.json, chrome-extension://, <all_urls>, webRequestBlocking, declarativeNetRequest, externally_connectable, nativeMessaging.

skills/web/web-extension-reverse/SKILL.md

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Last checked: Nov 7, 2026

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Repository stars (not skill ratings): 27
Repository last updated: Oct 14, 2026
License: MIT

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# Browser extension reverse engineering

## When it applies
The target is a browser extension — a `.crx`/`.xpi` package or an unpacked extension directory —
not ordinary page JavaScript (for that, load `reverse-eng-js`). Typical jobs: audit an in-scope
extension's client-side signing/encryption/proxy logic, hunt for over-privileged permissions in a
review, or investigate a malicious or supply-chain-poisoned extension. Target must be confirmed in
`scope.txt` (`tradecraft-scope-roe`); for malicious samples work in an isolated VM and see
`defense-malware-triage`.

## Why it works
An extension is just a zip with a `manifest.json` that declares its entire trust surface —
permissions, host permissions, entry scripts. Reading the manifest first tells you exactly which
scripts can touch which origins, and every browser-API capability (`webRequest`, `cookies`,