Examine source code of ResourceHive

{
  "manifest_version": 3,
  "name": "ResourceHive",
  "version": "1.0.0",
  "description": "Audit resource timing hotspots by type, domain, duration, and transfer size.",
  "icons": {
    "48": "glyph/icon-48.png",
    "96": "glyph/icon-96.png",
    "128": "glyph/icon-128.png"
  },
  "action": {
    "default_title": "ResourceHive",
    "default_icon": {
      "48": "glyph/icon-48.png"
    }
  },
  "background": {
    "scripts": [
      "bridge/router.js"
    ],
    "service_worker": "bridge/router.js"
  },
  "permissions": [
    "activeTab",
    "scripting",
    "tabs"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{f86706c3-b5b1-4efc-ab7c-6f6bc6893b60}",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}