Examine source code of cmsHelper

{
  "name": "cmsHelper",
  "description": "Ваш помощник для работы с CMS Bitrix / WordPress / NetCat",
  "version": "1.4.1",
  "manifest_version": 2,
  "action": {
    "default_icon": {
      "16": "/images/b16.png",
      "32": "/images/b32.png",
      "48": "/images/b48.png",
      "128": "/images/b128.png"
    },
    "default_popup": "popup.html"
  },
  "icons": {
    "16": "/images/b16.png",
    "32": "/images/b32.png",
    "48": "/images/b48.png",
    "128": "/images/b128.png"
  },
  "permissions": [
    "activeTab",
    "scripting"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "script.js"
      ],
      "run_at": "document_end"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{7ef30cc3-1629-457f-83b6-972d547c4dbc}"
    }
  }
}