Examine source code of Google Meet Mute Toggle

{
  "manifest_version": 2,
  "name": "Google Meet Mute Toggle",
  "version": "1.0",
  "description": "A Firefox extension to toggle Google Meet microphone with global shortcuts.",
  "permissions": [
    "tabs",
    "activeTab",
    "storage"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "*://meet.google.com/*"
      ],
      "js": [
        "content-script.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "commands": {
    "toggle-mute": {
      "suggested_key": {
        "default": "Alt+Shift+M"
      },
      "description": "Toggle Google Meet Microphone"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{3f22b074-42f0-4f64-affa-861180bc7d69}"
    }
  }
}