Solution Steps

1. Clear Firefox cache: Press Ctrl+Shift+Delete (Windows) or Cmd+Shift+Delete (Mac).
2. Select "Everything" for time range and check "Cache". Click "Clear Now".
3. Disable unnecessary extensions: Menu → Add-ons → Extensions → Disable unused ones.
4. Update Firefox: Menu → Help → About Firefox (auto-updates if available).
5. Reset Firefox preferences: Type "about:config" in address bar → Search for problematic preferences.
6. Restart Firefox in Safe Mode: Hold Shift while opening Firefox.
7. Reinstall Firefox if issues persist.