Examine source code of Vid Speed Up

{
  "manifest_version": 3,
  "name": "Video Speed Controller",
  "version": "1.2",
  "description": "Forces custom video playback speed with a console-like context selector.",
  "browser_specific_settings": {
    "gecko": {
      "id": "echo-speed-controller@local.extension",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "activeTab",
    "scripting",
    "webNavigation"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "action": {
    "default_popup": "popup.html"
  }
}