Examine source code of Elements highlighter

{
  "name": "Elements highlighter",
  "description": "Highlights items by css class prefix or attribute name",
  "version": "1.3",
  "icons": {
    "16": "images/icon16.png",
    "32": "images/icon32.png",
    "96": "images/icon96.png",
    "128": "images/icon128.png"
  },
  "permissions": [
    "activeTab",
    "storage"
  ],
  "background": {
    "scripts": [
      "js/background.js"
    ],
    "persistent": false
  },
  "options_ui": {
    "page": "options.html"
  },
  "browser_action": {
    "default_title": "Highlight elements",
    "default_icon": {
      "16": "images/icon16.png",
      "32": "images/icon32.png",
      "96": "images/icon96.png",
      "128": "images/icon128.png"
    },
    "default_popup": "popup.html"
  },
  "manifest_version": 2
}