Examine source code of Webcam Use Alert

{
  "manifest_version": 2,
  "name": "Webcam Use Alert",
  "version": "1.0",
  "description": "Alerts when a webpage accesses the webcam.",
  "permissions": [
    "notifications"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_start"
    }
  ],
  "icons": {
    "48": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{aa784422-450c-4249-b5e5-0d233ff7f3a4}"
    }
  }
}