Examine source code of Button Clicker

{
  "manifest_version": 2,
  "name": "Button Clicker",
  "version": "1.1resigned1",
  "description": "Clicks all buttons on the page",
  "icons": {
    "48": "icons/cursor.svg",
    "96": "icons/cursor.svg"
  },
  "applications": {
    "gecko": {
      "id": "dishendramishra@gmail.com"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.sanfoundry.com/*"
      ],
      "js": [
        "button-clicker.js"
      ]
    }
  ]
}