Examine source code of mirko.pro

{
  "manifest_version": 2,
  "name": "mirko.pro",
  "version": "1.0.4",
  "icons": {
    "16": "assets/icons/favicon-16.png",
    "32": "assets/icons/favicon-32.png",
    "48": "assets/icons/favicon-48.png",
    "128": "assets/icons/favicon-128.png"
  },
  "description": "Wtyczka dla serwisu wykop.pl",
  "homepage_url": "https://mirko.pro",
  "short_name": "mirko.pro",
  "applications": {
    "gecko": {
      "id": "{ab29902c-6a39-4d58-8cc8-7be896af6d16}"
    }
  },
  "permissions": [
    "storage"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "assets/icons/favicon-16.png",
      "32": "assets/icons/favicon-32.png",
      "48": "assets/icons/favicon-48.png",
      "128": "assets/icons/favicon-128.png"
    },
    "default_title": "mirko.pro"
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "background": {
    "scripts": [
      "js/background.bundle.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "https://*.mirko.pro/*"
      ],
      "js": [
        "js/contentScript.bundle.js"
      ],
      "run_at": "document_start"
    },
    {
      "matches": [
        "https://*.wykop.pl/*"
      ],
      "js": [
        "js/contentScriptWykop.bundle.js"
      ],
      "run_at": "document_start"
    },
    {
      "matches": [
        "https://*.hejto.pl/*"
      ],
      "js": [
        "js/contentScriptHejto.bundle.js"
      ],
      "run_at": "document_start"
    }
  ],
  "web_accessible_resources": [
    "css/wykopDarkClassic.css",
    "css/hejtoDarkClassic.css"
  ]
}