Examine source code of YouTube Channel Filter

{
  "manifest_version": 3,
  "name": "YouTube Channel Filter",
  "version": "2.3",
  "description": "Only show videos from selected YouTube channels.",
  "permissions": [
    "storage"
  ],
  "host_permissions": [
    "*://*.youtube.com/*"
  ],
  "icons": {
    "48": "icon.svg",
    "128": "icon.svg"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.youtube.com/*"
      ],
      "js": [
        "intercept.js"
      ],
      "run_at": "document_start",
      "world": "MAIN"
    },
    {
      "matches": [
        "*://*.youtube.com/*"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "intercept.js"
      ],
      "matches": [
        "*://*.youtube.com/*"
      ]
    }
  ],
  "action": {
    "default_popup": "popup.html",
    "default_title": "Filter Channels",
    "default_icon": "icon.svg"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "yt-channel-filter@local.extension",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}