Examine source code of Time tracker and activity

{
  "manifest_version": 2,
  "name": "Time tracker and activity",
  "description": "Track break times and suggest relaxation activities.",
  "version": "1.1",
  "permissions": [
    "storage",
    "alarms",
    "notifications"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "32": "icons/logo_32.png",
      "64": "icons/logo_64.png",
      "128": "icons/logo_128.png"
    }
  },
  "icons": {
    "32": "icons/logo_32.png",
    "64": "icons/logo_64.png",
    "128": "icons/logo_128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{d1ed9081-2a65-4996-8027-91dd5ff4dbcc}"
    }
  }
}