Firefox Profile Missing Troubleshooting Checklist
When Firefox starts but shows none of your bookmarks, passwords, or extensions, the profile may b...
Checklists for software errors, setup, and tool workflows.
1. Reproduce
2. Isolate
3. Apply
4. Verify
Latest checklists
View listHow to Fix Windows Security Error 'Access Denied' on Startup
If you see a Windows Security error saying 'Access Denied' right when your PC boots up, it usuall...
How to Fix Windows Defender 404 Not Found Error
If you see a "404 Not Found" error when opening Windows Defender, it often means a required file ...
Fix Windows Security Virus Scan Slow Performance
If your Windows Security (formerly Windows Defender) virus scan takes forever or slows down your ...
Fix Windows Defender Firewall Blocking Internet Access
If your internet stops working after a Windows update or security change, Windows Defender Firewa...
Fix Microsoft Store Access Denied for Admin Account
You're signed in with an administrator account, but Microsoft Store still shows 'Access Denied' o...
Topic paths
Quick titles
Windows Security Service Not Running? Here's the FixHow to Resolve Windows Defender Port Already Allocated on Windows 10How to Sync Node Versions Locally and on the ServerFix Microsoft Edge When It Stops RespondingTroubleshooting Windows Defender Rate Limit on Windows 11Fix: Windows Security Service Disabled by Group Policy ErrorAndroid Studio JDK Not Found: How to FixWindows Security 502 Bad Gateway Fix