Examine source code of WolnaDzida

{
  "manifest_version": 2,
  "name": "WolnaDzida",
  "version": "1.6",
  "description": "Allow to delete posts what u don't want to see",
  "content_scripts": [
    {
      "matches": [
        "*://*.jbzdy.eu/mikroblog*"
      ],
      "js": [
        "jquery.js",
        "blocker.js"
      ]
    }
  ],
  "icons": {
    "48": "icon.png"
  },
  "permissions": [
    "tabs",
    "<all_urls>"
  ]
}