Examine source code of Web Security Helper

{
  "manifest_version": 2,
  "name": "Web Secruity Helper",
  "author": "NetGuard Pioneer",
  "description": "__MSG_extension_description__",
  "version": "1.3.0",
  "browser_specific_settings": {
    "gecko": {
      "id": "ariwa7953@gmail.com",
      "strict_min_version": "58.0"
    }
  },
  "icons": {
    "16": "icons/light/16.png",
    "32": "icons/light/32.png",
    "48": "icons/light/48.png",
    "128": "icons/light/128.png"
  },
  "browser_action": {
    "default_icon": {
      "16": "icons/light/16.png",
      "32": "icons/light/32.png",
      "48": "icons/light/48.png"
    },
    "default_title": "Web Sheild",
    "default_popup": "content/popup.html"
  },
  "permissions": [
    "webRequest",
    "tabs",
    "storage",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "contentScript.js"
      ]
    }
  ]
}