What security software besides MS Defender are you running? Windows home or pro? If it's just spinning, look in the bottom left corner and it should show what it's waiting for. Post a screenshot Does it happen with Firefox in Troubleshoot Mode? https://support.mozilla.org/en-US/kb/diagnose-firefox-issues-using-troubleshoot-mode#search Did you clear your browser cache? https://support.mozilla.org/en-US/kb/clear-cookies-and-site-data-firefox+