'''Show the issue.''' Hard to help with something we cannot see or replicate. This works for me. see screenshot https://www.udemy.com/course/the-linux-command-line-bootcamp/?couponCode=MT80825C Are you running any security software besides MS Defender? Did you try with Firefox in Troubleshoot Mode? https://support.mozilla.org/en-US/kb/diagnose-firefox-issues-using-troubleshoot-mode#w_how-to-start-firefox-in-4troubleshoot-modesf5safe-modesf