This is what I have done so far: I have done a full OS refresh of Windows 10. Used Revo Uninstaller to remove all program files, Registry items. Deleted all App data for every User account. Re-installed Firefox with a fresh installer. What happens: After installing Firefox it will open once, and only once. If I close it at any point, it will never open again unless I re-install it. It will not open in Safe Firefox Safe mode (Holding shift) It will not open in Windows 10 Safe Mode It will not open with my firewall completely disabled my anti-virus uninstalled & off It will not open after restarting my PC It will not open after refreshing my OS again It will not open after Administrator Command Prompt ipconfig /flushdns It will not open after Administrator Command Prompt netsh winsock reset (And restarting) It will not open after clicking refresh re-installing it It will not open after deleting all extensions/cookies/profiles (again) It will not open after deleting all contents of the start-up folder. firefox.exe -p does not open or work Firefox will only open -ONCE- immediately after re-installing it, I do not know what other options I have besides literally doing a clean install of my entire operating system. I will get background processes when I try to open Firefox as if it's open, I've already tried closing them then opening again but the program still doesn't open. I'm at the point where if I want to use firefox, I have to run the installer & it will open then I can use firefox until I close it then I have to run the installer again for it to open. Literally everything works except for Firefox, I can run every program, game, stream/record video, etc. I have been bending over backwards doing everything I can to see if something else was going on, if anyone has any troubleshooting, I can try outside of what I've already done so far please let me know I'd like to resolve this without having to restore my entire PC for just firefox. PC Specs: AMD Ryzen 7 32GB of Ram GPU Nvidia 2070 Windows 10 Home 21H2