Examine source code of Dan Overlay for osu!web

{
  "manifest_version": 3,
  "name": "Dan Overlay for osu!web",
  "version": "3.0.0",
  "description": "Estimated osu!mania dan tier, MSD and Quaver rating for the open beatmap, computed in-browser.",
  "permissions": [
    "storage",
    "activeTab"
  ],
  "host_permissions": [
    "https://osu.ppy.sh/*"
  ],
  "icons": {
    "16": "icons/icon16.png",
    "32": "icons/icon32.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "action": {
    "default_popup": "popup.html",
    "default_title": "Dan Overlay",
    "default_icon": {
      "16": "icons/icon16.png",
      "32": "icons/icon32.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    }
  },
  "content_security_policy": {
    "extension_pages": "script-src 'self' 'wasm-unsafe-eval'; object-src 'self'"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "danoverlay-web@chowell.it",
      "strict_min_version": "115.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}