Examine source code of Facebook Blocker

{
  "manifest_version": 2,
  "name": "Facebook Blocker",
  "description": "Blocks the Facebook for given time period, For the self motivated people who dont want to get distracted duing work hours",
  "version": "2.6",
  "homepage_url": "https://github.com/tsl143/jsDemos/fbBlocker_webext",
  "icons": {
    "32": "icons/logo_32.png",
    "48": "icons/logo_48.png",
    "64": "icons/logo_64.png"
  },
  "background": {
    "scripts": [
      "stopIt.js"
    ]
  },
  "options_ui": {
    "page": "options.html",
    "browser_style": true
  },
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "<all_urls>",
    "notifications",
    "storage"
  ]
}