Examine source code of Tab Backup

{
  "manifest_version": 3,
  "version": "0.6.4",
  "name": "Tab Backup",
  "description": "Import and export tabs to a file.",
  "permissions": [
    "tabs",
    "downloads"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "action": {
    "default_title": "Tab Backup",
    "default_popup": "popup.html",
    "default_icon": {
      "32": "icons/folder_10773696-@32px.png"
    },
    "theme_icons": [
      {
        "light": "icons/folder_10773696-@16px.png",
        "dark": "icons/folder_10773696-@16px.png",
        "size": 16
      },
      {
        "light": "icons/folder_10773696-@32px.png",
        "dark": "icons/folder_10773696-@32px.png",
        "size": 32
      },
      {
        "light": "icons/folder_10773696-@64px.png",
        "dark": "icons/folder_10773696-@64px.png",
        "size": 64
      }
    ]
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{ab17cf31-d05a-44c9-9b9b-603023cf9ce1}"
    }
  }
}