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Start Firefox using Troubleshoot(Safe) Mode {web link}

A small dialog should appear. Click Start In Troubleshoot(Safe) Mode (not Refresh). Is the problem still there?

May or may not be related but it appears you may be running Firefox 93.0 in Windows Vista compatibility mode for some reason or you manually changed the useragent as the other possibility.

In your More System Details on right of your post User Agent: Mozilla/5.0 (Windows NT 6.0; Win64; x64; rv:93.0) Gecko/20100101 Firefox/93.0

NT 6.0 is Windows Vista as the latest Firefox version to still support Windows Vista and XP was the old Firefox 52.0.0 esr.

https://support.microsoft.com/en-us/windows/make-older-apps-or-programs-compatible-with-windows-10-783d6dd7-b439-bdb0-0490-54eea0f45938 https://www.tenforums.com/tutorials/15523-change-compatibility-mode-settings-apps-windows-10-a.html

The articles should help you uncheck the compatibility mode for the Firefox.exe

You can try to disable hardware acceleration in Firefox.

• Settings -> General: Performance
  remove checkmark: [ ] "Use recommended performance settings"
  remove checkmark: [ ] "Use hardware acceleration when available"
• https://support.mozilla.org/en-US/kb/performance-settings

Close and restart Firefox after modifying the setting to make changes effective.

• https://support.mozilla.org/en-US/kb/troubleshoot-extensions-themes-to-fix-problems

You can check if there is an update for your graphics display driver and check for hardware acceleration related issues.

• https://support.mozilla.org/en-US/kb/upgrade-graphics-drivers-use-hardware-acceleration