How do I get this to run?

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Javascript

errors

So while learning javascript, I decided to make a silly script that would ask the user, how many tabs they wanted to open, and would then create that many tabs. The problem is when I try making it a bookmark on google chrome with the javascript: header, the code no longer works.

What I have tried:

I tried the code on www.jsconsole.com as well as https://repl.it/repls and it worked on both, so I don't know what I'm doing wrong. I tried executing the code without the do loop, and just opening one tab, and it worked just fine. So I have no idea what;s wrong. Here's the code...

var count = 0;

var tabAmount = prompt("How many tabs would you like to open?");

do {
  window.open()
  count = count + 1;
}
while (count < tabAmount);

I'm seriously confused so any explanation as to why it doesn't work would be great.