Examine source code of Website Safety Checker

{
  "manifest_version": 2,
  "name": "Website Safety Checker",
  "version": "1.0",
  "description": "Automatically checks the safety of websites based on an online security database.",
  "permissions": [
    "activeTab",
    "webRequest",
    "storage",
    "notifications",
    "https://safebrowsing.googleapis.com/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content_script.js"
      ]
    }
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "32": "icons/logo_32.png",
      "64": "icons/logo_64.png",
      "128": "icons/logo_128.png"
    }
  },
  "icons": {
    "32": "icons/logo_32.png",
    "64": "icons/logo_64.png",
    "128": "icons/logo_128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{9c7d512c-d950-443d-9368-9803c2e3e6ea}"
    }
  }
}