Examine source code of Video Speed Toggle

{
  "manifest_version": 2,
  "name": "Video Speed Toggle",
  "version": "1.0",
  "description": "Toggle video playback speed between 1x and 2x with a keyboard shortcut",
  "icons": {
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "*://*/*"
      ],
      "js": [
        "js/content.js"
      ]
    }
  ],
  "commands": {
    "toggle-speed": {
      "suggested_key": {
        "default": "Alt+S"
      },
      "description": "Toggle video speed between 1x and 2x"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "video-speed-toggle@example.com"
    }
  },
  "permissions": [
    "activeTab"
  ]
}