Examine source code of osu!idle Score extractor

{
  "manifest_version": 3,
  "name": "osu!idle Score extractor",
  "version": "0.2.1",
  "description": "Extract various data from an osu!idle scoreboard",
  "permissions": [
    "activeTab",
    "clipboardWrite",
    "scripting",
    "storage"
  ],
  "host_permissions": [
    "https://a.ppy.sh/*",
    "https://api.osu.idle.rhythmgamers.net/*",
    "https://osu.idle.rhythmgamers.net/*"
  ],
  "action": {
    "default_popup": "popup/popup.html",
    "default_icon": {
      "16": "icons/16.png",
      "32": "icons/32.png",
      "48": "icons/48.png",
      "128": "icons/128.png"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "https://osu.idle.rhythmgamers.net/*"
      ],
      "js": [
        "content/content.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "icons": {
    "16": "icons/16.png",
    "32": "icons/32.png",
    "48": "icons/48.png",
    "128": "icons/128.png"
  },
  "background": {
    "scripts": [
      "background/background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "osu-idle-score-extractor@demonwaves",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}