manifest.json

{
  "manifest_version": 2,
  "background": { "scripts": ["background.js"] },
  "browser_action": {
    "default_icon": "icon.png",
    "name": "Test",
    "default_popup": "popup.html"
  },
  "name": "Simple Hash XSS",
  "description": "This extension automates testing of a simple hash XSS payload commonly triggered by ad code, optionally collecting the results for research purposes",
  "version": "1.0",
  "permissions": [
    "storage"
  ],
  "web_accessible_resources": [
    "alert.mp3"
  ],
  "content_scripts": [
    {
      "matches": ["http://*/*", "https://*/*"],
	  "run_at": "document_start",
      "js": ["script.js"]
    }
  ]
}