Examine source code of TubeFeed

{
  "manifest_version": 3,
  "name": "TubeFeed",
  "version": "0.6.16",
  "description": "YouTube RSS reader. Follow channels without a Google account. Track watched videos and unread counts at a glance.",
  "browser_specific_settings": {
    "gecko": {
      "id": "tubefeed@weks",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    }
  },
  "permissions": [
    "storage",
    "alarms",
    "tabs",
    "scripting"
  ],
  "host_permissions": [
    "https://www.youtube.com/*",
    "https://consent.youtube.com/*",
    "https://www.google.com/sorry/*",
    "https://www.googleapis.com/*"
  ],
  "background": {
    "scripts": [
      "src/background/service-worker.js"
    ],
    "type": "module"
  },
  "content_scripts": [
    {
      "matches": [
        "https://www.youtube.com/*"
      ],
      "js": [
        "src/content/youtube.js"
      ]
    }
  ],
  "icons": {
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png",
    "128": "icons/icon-128.png"
  },
  "action": {
    "default_title": "TubeFeed",
    "default_area": "navbar",
    "default_icon": {
      "16": "icons/icon-16.png",
      "32": "icons/icon-32.png",
      "48": "icons/icon-48.png"
    }
  }
}