Examine source code of Google Redirect Unwrap

{
  "description": "Stops and unwraps Google redirect URL requests to prevent Google from tracking you via those HTTP requests. Works for all URLs of the form \"https://www.google.com/url?q=[Destination]\".",
  "manifest_version": 2,
  "name": "GoogleRedirectUnwrap",
  "version": "1.2resigned1",
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "https://www.google.com/"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{190471ea-ead1-4d43-9a88-79f2d6e94cde}"
    }
  }
}