Examine source code of adblock

{
  "name": "adblock",
  "version": "2.0",
  "manifest_version": 2,
  "description": "Block add in Yandex Disk",
  "content_scripts": [
    {
      "matches": [
        "https://docviewer.yandex.com/*"
      ],
      "js": [
        "scripts/block.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{183dfef3-d1a2-49a4-8c31-6ead6273d78f}"
    }
  }
}