Examine source code of Age Analysis

{
  "manifest_version": 2,
  "name": "Age Analysis",
  "version": "1.0",
  "description": "Generate an age analysis, year by year, with breakdowns of days, weeks, hours, minutes, and seconds.",
  "permissions": [
    "activeTab"
  ],
  "browser_action": {
    "default_popup": "popup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{118f73ef-5d93-4df8-9d29-58d24d09d931}"
    }
  }
}