Examine source code of Scanner Blocker

{
  "manifest_version": 2,
  "name": "Scanner Blocker",
  "version": "0.1",
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "<all_urls>",
    "webRequest",
    "webRequestBlocking",
    "activeTab"
  ],
  "page_action": {
    "pinned": true,
    "default_popup": "page_action.html",
    "browser_style": true,
    "default_title": "Scanner blocker"
  },
  "default_locale": "en"
}