Examine source code of Technology Backgrounds

{
  "manifest_version": 2,
  "name": "Technology Backgrounds",
  "description": "This is the Technology background extension.",
  "version": "2.7",
  "browser_action": {},
  "permissions": [],
  "content_security_policy": "script-src 'self' 'unsafe-eval'; object-src 'self'",
  "chrome_url_overrides": {
    "newtab": "index.html"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "icons": {
    "16": "icon16.png",
    "32": "icon32.png",
    "48": "icon48.png",
    "128": "icon128.png"
  }
}