Examine source code of Save My Tabs

{
  "manifest_version": 2,
  "name": "Save My Tabs",
  "version": "1.0",
  "description": "Save current tab URLs and revisit them anytime.",
  "permissions": [
    "tabs",
    "storage",
    "activeTab"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "48": "icon.png"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "icons": {
    "48": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{ba7d8470-79d2-4c1f-bd15-da2fb0849009}"
    }
  }
}