Examine source code of ezRetime

{
  "name": "ezRetime",
  "description": "A speedrun video retimer for Twitch, YouTube, and more! Click the extension icon on a page to run it.",
  "permissions": [
    "activeTab",
    "scripting"
  ],
  "icons": {
    "128": "/icon.png"
  },
  "action": {
    "default_title": "Run ezRetime on current page."
  },
  "background": {
    "scripts": [
      "/worker.js"
    ]
  },
  "web_accessible_resources": [
    {
      "resources": [
        "scripts/*.js"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ],
  "version": "1.0.5",
  "manifest_version": 3,
  "browser_specific_settings": {
    "gecko": {
      "id": "@ezretime",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}