Examine source code of FocusShield

{
  "manifest_version": 3,
  "name": "FocusShield",
  "version": "1.0.0",
  "description": "Audit focus-style policies, outline suppression patterns, and focus-visible coverage.",
  "icons": {
    "48": "glyph/icon-48.png",
    "96": "glyph/icon-96.png",
    "128": "glyph/icon-128.png"
  },
  "action": {
    "default_title": "FocusShield",
    "default_popup": "panel/view.html",
    "default_icon": {
      "48": "glyph/icon-48.png"
    }
  },
  "background": {
    "scripts": [
      "worker/hub.js"
    ],
    "service_worker": "worker/hub.js"
  },
  "permissions": [
    "activeTab",
    "scripting",
    "storage",
    "tabs",
    "contextMenus",
    "notifications"
  ],
  "commands": {
    "focusshield-run": {
      "description": "Run focus-style audit on active tab",
      "suggested_key": {
        "default": "Alt+Shift+F"
      }
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{a19e4c6c-3e3e-4968-928b-4853be160da8}",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}