Examine source code of jbzdyBlocker

{
  "manifest_version": 2,
  "name": "jbzdyBlocker",
  "version": "1.1",
  "description": "Zablokuj jbzdy do godziny 19",
  "content_scripts": [
    {
      "matches": [
        "*://*.jbzdy.eu/*"
      ],
      "js": [
        "main.js"
      ]
    }
  ],
  "background": {
    "scripts": [
      "backbutton.js"
    ]
  },
  "icons": {
    "48": "icons/logo.png"
  },
  "browser_action": {
    "default_icon": {
      "48": "icons/logo_small.png"
    }
  },
  "permissions": [
    "tabs",
    "<all_urls>"
  ]
}