Examine source code of Behave!

{
  "manifest_version": 2,
  "name": "Behave!",
  "version": "0.9.7.1",
  "short_name": "Behave!",
  "author": "Stefano Di Paola",
  "description": "A monitoring browser extension for pages acting as bad boys ",
  "icons": {
    "16": "img/favicon_io/icon-16x16.png",
    "48": "img/favicon_io/icon-48x48.png",
    "128": "img/favicon_io/icon-128x128.png"
  },
  "incognito": "spanning",
  "browser_action": {
    "default_icon": {
      "16": "img/favicon_io/icon-16x16.png",
      "32": "img/favicon_io/icon-32x32.png"
    },
    "default_popup": "ui/popup.html",
    "default_title": "Behave!"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "notifications",
    "storage",
    "<all_urls>",
    "tabs"
  ]
}