Time to 60fps

manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "manifest_version": 2,
  "name": "Time to 60fps",
  "description": "This extension shows the time it takes for a web page to reach 60fps",
  "version": "1.1",
  "browser_action": {
    "default_icon": "60fps-19x19.png"
  },
  "icons": {
    "48": "60fps-48x48.png",
    "128": "60fps-128x128.png"
  },
  "permissions": [
    "activeTab"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "*://*/*"
      ],
      "js": [
        "time-to-60fps.js"
      ],
      "run_at": "document_start"
    }
  ]
}