Examine source code of oii

{
  "manifest_version": 3,
  "name": "oii",
  "description": "Adds ii (improvement indicator) metric to user profiles on the osu! website",
  "version": "2025.11.1",
  "action": {
    "default_popup": "popup/popup.html"
  },
  "icons": {
    "16": "images/oii16.png",
    "32": "images/oii32.png",
    "48": "images/oii48.png",
    "128": "images/oii128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{e844d8ad-7f10-4de7-ad36-13c95d10aae4}"
    }
  },
  "content_scripts": [
    {
      "js": [
        "popup/browser-polyfill.min.js",
        "scripts/content.js"
      ],
      "matches": [
        "https://osu.ppy.sh/*"
      ],
      "run_at": "document_idle"
    }
  ]
}