Examine source code of Daily Session Saver

{
  "manifest_version": 2,
  "name": "Daily Session Saver",
  "version": "1.1",
  "description": "Automatically saves browser sessions daily and allows restoring them.",
  "permissions": [
    "tabs",
    "storage",
    "alarms"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "48": "icons/circular.png"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{d160e17a-83ab-49a6-ae1d-5bb3e13dabaa}"
    }
  }
}