function pdfWindow() {
    const { BrowserWindow } = require('electron').remote
    const PDFWindow = require('electron-pdf-window')
    const win = new BrowserWindow({ width: 800, height: 800 })
    PDFWindow.addSupport(win)
    win.loadURL('http://mozilla.github.io/pdf.js/web/compressed.tracemonkey-pldi-09.pdf')
}