Examine source code of pp calculator

{
  "manifest_version": 3,
  "name": "pp calculator",
  "description": "Calculates the osu! pp values directly in your web browser",
  "version": "1.4.0",
  "icons": {
    "128": "icons/icon_128.png"
  },
  "permissions": [
    "storage",
    "tabs"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://osu.ppy.sh/*"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "action": {
    "default_title": "pp calculator",
    "default_popup": "popup.html",
    "default_icon": {
      "128": "icons/icon_128.png"
    }
  },
  "host_permissions": [
    "*://*.ppy.sh/"
  ],
  "content_security_policy": {
    "extension_pages": "script-src 'self' 'wasm-unsafe-eval'; object-src 'self'; worker-src 'self'"
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": false
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{6e3f516b-0653-4d26-87c5-bc71749229ee}"
    }
  }
}