Examine source code of STFU - Smart Tab Muting

{
  "manifest_version": 2,
  "name": "STFU - Smart Tab Muting",
  "version": "1.0.0",
  "description": "Automatically mute tabs from specific URL prefixes. Keep your browsing experience quiet.",
  "icons": {
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png"
  },
  "permissions": [
    "tabs",
    "storage",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "browser_action": {
    "default_icon": "icons/icon-48.png",
    "default_title": "STFU - Manage Muted Sites",
    "default_popup": "popup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "stfu@example.com",
      "strict_min_version": "58.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}