Examine source code of unSearchify

{
  "manifest_version": 2,
  "name": "unSearchify",
  "version": "1.0.1",
  "description": "Remove unwanted sites from Google search results",
  "permissions": [
    "activeTab"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://*.google.com/*"
      ],
      "js": [
        "contentScript.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{dc4e82c1-0ac1-477b-a980-10eb4508e0e6}"
    }
  }
}