Examine source code of YouTube Mobile Forcer

{
  "manifest_version": 3,
  "name": "YouTube Mobile Forcer",
  "version": "1.0",
  "description": "Forces lightweight mobile YouTube on PC for better performance",
  "browser_specific_settings": {
    "gecko": {
      "id": "youtube-mobile-forcer@kip.com",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "declarativeNetRequest",
    "declarativeNetRequestWithHostAccess"
  ],
  "host_permissions": [
    "*://www.youtube.com/*",
    "*://youtube.com/*",
    "*://m.youtube.com/*"
  ],
  "declarative_net_request": {
    "rule_resources": [
      {
        "id": "ruleset_1",
        "enabled": true,
        "path": "rules.json"
      }
    ]
  },
  "action": {
    "default_popup": "popup.html",
    "default_icon": {
      "48": "icon.png"
    }
  },
  "icons": {
    "48": "icon.png"
  }
}