Examine source code of Porn site Blocker

{
  "manifest_version": 2,
  "name": "Porn site Blocker",
  "version": "1.0.3resigned1",
  "description": "A basic porn site blocker addons",
  "icons": {
    "32": "icons/moz.png",
    "48": "icons/moz.png",
    "96": "icons/moz.png"
  },
  "author": "Hashemi Rafsan",
  "applications": {
    "gecko": {
      "id": "{100d4af3-b61a-4cbc-bc3c-b340c7cb2121}",
      "strict_min_version": "42.0",
      "strict_max_version": "53.*"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "*://*/*"
      ],
      "js": [
        "contentscript.js"
      ]
    }
  ],
  "page_action": {
    "browser_style": true,
    "default_icon": {
      "19": "icons/moz.png",
      "38": "icons/moz.png"
    }
  },
  "permissions": [
    "webRequest",
    "*://*/*",
    "tabs"
  ]
}