I have be using Firefox Browser with Norton VPN turned on for a few years now without any problems. I was browsing and got connected to a website, then ever since Firefox stops working when Norton VPN is turned on. I tried uninstalling Firefox completely using software, and reinstalled Firefox it, with no success. The Virus scans are clean. I have a dual boot of Windows 10 and 11. I use Windows 10 the most. I changed to Windows 11 and had no problems with Firefox until I imported bookmarks from Windows 10's Firefox.