Examine source code of NoFollow Highlights

{
  "background": {
    "persistent": true,
    "scripts": [
      "logger.js",
      "cross.js",
      "storage.js",
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": {
      "16": "images/icon-016.png",
      "19": "images/icon-019.png",
      "32": "images/icon-032.png",
      "38": "images/icon-038.png"
    },
    "default_popup": "popup.html",
    "default_title": "NoFollow"
  },
  "content_scripts": [
    {
      "all_frames": true,
      "js": [
        "includes/content.js"
      ],
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "run_at": "document_start"
    }
  ],
  "description": "Outline nofollow links, detect nofollow and noindex meta tags on webpages. Features website filtering and custom CSS outline styles.",
  "homepage_url": "https://www.igorware.com/extensions/nofollow?referrer-ver=chrome-ext-manager",
  "icons": {
    "16": "images/icon-016.png",
    "19": "images/icon-019.png",
    "32": "images/icon-032.png",
    "38": "images/icon-038.png",
    "48": "images/icon-048.png",
    "64": "images/icon-064.png",
    "128": "images/icon-128.png"
  },
  "key": "MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQC+lkeW1OpYulcwpBUZLWSaKfkrKQImp+DcNOa46Yd/MbAFoSmgq4WlP3BRNjovsKHKhGc6cJ0Xx6oaZLDhPE7QlaCIrtk1Qxad7s6H37mkPwKuZPzeemVy/sU/Bxx3R7zIsFTIJx2xybji50OGnqCHWyxJNn+iM0BSr5A9mc/6mQIDAQAB",
  "manifest_version": 2,
  "minimum_chrome_version": "39",
  "name": "NoFollow",
  "offline_enabled": true,
  "options_page": "options.html",
  "options_ui": {
    "chrome_style": true,
    "open_in_tab": true,
    "page": "options.html"
  },
  "permissions": [
    "storage",
    "tabs",
    "http://*/*",
    "https://*/*"
  ],
  "update_url": "https://clients2.google.com/service/update2/crx",
  "version": "5.2.1"
}