Examine source code of Risa SERP

{
  "manifest_version": 2,
  "name": "Risa SERP",
  "version": "1.1resigned1",
  "description": "This extension plugin will count the organic Google search results.",
  "author": "Robbie Wolsey",
  "content_scripts": [
    {
      "matches": [
        "https://www.google.com/*"
      ],
      "js": [
        "content_script.js"
      ]
    }
  ],
  "permissions": [
    "activeTab",
    "storage"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{4a708470-8802-4139-bc9c-87cc71987b9f}"
    }
  }
}