Examine source code of Sweezy Custom Progress Bar for Youtube™

{
  "name": "__MSG_extName__",
  "description": "__MSG_extDescription__",
  "version": "3.0.1",
  "manifest_version": 3,
  "icons": {
    "32": "assets/manifest_icons/icon-32.png",
    "48": "assets/manifest_icons/icon-48.png",
    "96": "assets/manifest_icons/icon-96.png",
    "128": "assets/manifest_icons/icon-128.png",
    "256": "assets/manifest_icons/icon-256.png"
  },
  "host_permissions": [
    "*://*.youtube.com/*"
  ],
  "permissions": [
    "storage",
    "scripting"
  ],
  "background": {
    "scripts": [
      "./background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.youtube.com/*"
      ],
      "js": [
        "./content_script.js"
      ],
      "run_at": "document_start",
      "all_frames": true
    }
  ],
  "action": {
    "default_popup": "popup.html"
  },
  "default_locale": "en",
  "content_security_policy": {
    "extension_pages": "script-src 'self'; object-src 'self';"
  },
  "web_accessible_resources": [
    {
      "resources": [
        "assets/images/progress_scrubbers/*"
      ],
      "matches": [
        "*://*.youtube.com/*"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "sweezy@local",
      "strict_min_version": "109.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}