Time spend on Facebook

manifest.json

{
  "update_url": "http://clients2.google.com/service/update2/crx",
  "name": "Time spend on Facebook",
  "version": "0.34",
  "description": "Tracks the time you spend on Facebook per day.",
  "manifest_version": 2,
  "background": {
    "scripts": [
      "script.js"
    ]
  },
  "permissions": [
    "tabs",
    "*://*.facebook.com/*"
  ],
  "content_security_policy": "script-src 'self' https://ssl.google-analytics.com; object-src 'self'",
  "icons": {
    "16": "icon16.png",
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.facebook.com/*"
      ],
      "js": [
        "time_tracking.js"
      ],
      "run_at": "document_end",
      "all_frames": false
    }
  ]
}