Examine source code of chat-popup

{
  "manifest_version": 2,
  "name": "chat-popup",
  "version": "3.0",
  "description": "Better chat windows!",
  "permissions": [
    "activeTab"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://web.whatsapp.com/*"
      ],
      "js": [
        "popup.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{9b99f63f-f9d5-4481-907c-3e59fba0b900}",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "icons": {
    "48": "icon.svg"
  },
  "web_accessible_resources": [
    "icons/half.svg",
    "icons/full.svg"
  ]
}