Examine source code of Universal Video Speed Keys

{
  "manifest_version": 3,
  "name": "Universal Video Speed Keys",
  "version": "1.0.0",
  "description": "Control playback speed on Vimeo and other embedded HTML5 videos with keyboard shortcuts and an on-video HUD.",
  "permissions": [
    "storage"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "universal-video-speed-keys@hamzahaque.dev",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    }
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "exclude_matches": [
        "*://*.youtube.com/*",
        "*://*.youtube-nocookie.com/*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle",
      "all_frames": true,
      "match_about_blank": true
    }
  ],
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  }
}