Examine source code of Auto-Logout Reminder

{
  "manifest_version": 2,
  "name": "Auto-Logout Reminder",
  "version": "1.0",
  "description": "Remind to log out from important sites.",
  "permissions": [
    "tabs",
    "storage"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": false
  },
  "icons": {
    "48": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{6f3c79ae-2934-40cd-b3a5-df8c55ac1128}"
    }
  }
}