Examine source code of Google Minus One

{
  "manifest_version": 3,
  "name": "Google Minus One",
  "version": "0.5",
  "description": "Removes the 'Upgrade' advertisement on Google online products, including Docs, Mail, Drive, etc. Around 25 lines of actual code. Nothing fancy.",
  "icons": {
    "48": "icons/minusOne48.png",
    "96": "icons/minusOne96.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "google.minus.one@claire.rosenthal",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.google.com/*"
      ],
      "js": [
        "googleMinusOne.js"
      ]
    }
  ]
}