Path

Windows
C:\Users\[login_name]\AppData\Local\Google\Chrome\User Data\Default\Extensions

Mac
./Library/Application Support/Google/Chrome/Default/Extensions/

manifest.json

Every extension has a manifest.json, that provides important information.

1
2
3
4
5
6
{
  "name": "Getting Started Example",
  "version": "1.0",
  "description": "Build an Extension!",
  "manifest_version": 2
}

https://developer.chrome.com/extensions/manifest