Made for Focus Mode for YouTube · works on any Chrome extension
Extension Safety Check
Pick an unpacked Chrome extension folder. This page reads the files in your browser and looks for the usual red flags. Nothing is uploaded; the page makes no network requests.
or drop the folder here
What it checks
Permissions and site access
What the extension can reach: your tabs, cookies, history, or every website.
Network calls
Code that could send data somewhere: fetch, XMLHttpRequest, WebSocket, beacons, web addresses.
Hidden or remote code
Text run as code (eval), scripts loaded from the internet, minified or encoded code.
Files and fingerprints
Every file, with a SHA-256 fingerprint to compare against a published release.
What this can and can't tell you.
It's a static scan: it reads the code and the manifest, it doesn't run anything.
It catches the common warning signs (broad permissions, network calls, code loaded at runtime, hidden code),
but a clean result isn't a guarantee. The strongest check is still reading the code, which for small extensions takes minutes.