Javascript challenges wont run

Whenever I open any challenge in “JavaScript Algorithms and Data Structures Certification (300 hours)” my browser(Firefox) has no internet anymore but when i cut it and open it again the net is working properly,
Js challenges have a bug that are doing something to browser

I suspect that there is an issue with your browser.

I’d try

  1. Disable extensions - one of your extensions could be interfering with the editor or tests
  2. Clear your cache - you might havo gotten stuck in a bad state
  3. Use incognito mode - a combo of 1 and 2 essentially
  4. Use a different browser - sometimes it’s an issue with your whole browser