Examine source code of Discuss URL

{
  "name": "Discuss URL",
  "description": "Discuss any URL or domain on the web.",
  "version": "0.2.0",
  "manifest_version": 2,
  "icons": {
    "48": "icons/logo_48.png",
    "96": "icons/logo_96.png"
  },
  "permissions": [
    "tabs"
  ],
  "browser_action": {
    "default_title": "Discuss URL",
    "default_popup": "popup/popup.html"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "options_ui": {
    "page": "options/options.html",
    "chrome_style": true
  },
  "content_security_policy": "script-src 'self' 'unsafe-eval'; object-src 'self'"
}