It seems like a situation where the desktop background has disappeared, and Firefox is displaying abnormally. Here are a few steps you can try to resolve these issues:
Restoring Desktop Background:
- Right-click on Desktop: Right-click on the desktop and choose "Personalize."
- Background Settings: In the Settings window, choose "Background" from the left pane.
- Choose a New Background: Select a background image or a solid color.
Fixing Firefox Issues:
- Restart Firefox: Close Firefox completely and reopen it.
- Clear Cache and Cookies: Go to Firefox settings and clear cache and cookies.
- Safe Mode: Try running Firefox in Safe Mode to troubleshoot extensions.