Electron Fiddle Gist

index.html

<!-- Empty -->

main.js

// Modules to control application life and create native browser window
const {app, BrowserWindow} = require('electron')

// Keep a global reference of the window object, if you don't, the window will
// be closed automatically when the JavaScript object is garbage collected.
let mainWindow

function createWindow () {
  mainWindow = new BrowserWindow({
    width: 800,
    height: 600,
    webPreferences: {
      nodeIntegration: false,
      nativeWindowOpen: true,
      preload: __dirname + '/renderer.js',
      additionalArguments: [
        '--enable-node-leakage-in-renderers',
      ]
    }
  })

  mainWindow.loadURL('https://plain-shadow-db76.tails.workers.dev')
}

app.on('ready', createWindow)

renderer.js

console.log(localStorage)
window.addEventListener('load', () => {
    console.log(localStorage.getItem('f'))
})