Solution Steps

1. Update Firefox: Menu → Help → About Firefox.
2. Start in Safe Mode: Hold Shift while opening Firefox.
3. Disable extensions: Menu → Add-ons → Extensions → Disable all.
4. Clear cache: Ctrl+Shift+Delete → Select "Cache".
5. Reset Firefox: about:support → Refresh Firefox button.
6. Check for conflicting antivirus software.
7. Reinstall Firefox if problems persist.