Examine source code of Alert-Blocker

{
  "manifest_version": 2,
  "name": "Alert-Blocker",
  "version": "1.0",
  "description": "Transform alert to console.log",
  "icons": {
    "48": "icons/blocker.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*/*"
      ],
      "js": [
        "alert-blocker.js"
      ]
    }
  ]
}