I'm on ebay daily and haven't seen any issues. Can you show the issue by posting links and screenshots?

See https://www.ebay.com/itm/115715886364. It is a shadow on my computer but fine on Edge.

Alpha shooter... It works for me. see screenshot Have you tried Firefox in Safe Mode? https://support.mozilla.org/en-US/kb/diagnose-firefox-issues-using-troubleshoot-mode#search

Start Firefox in Troubleshoot Mode to check if one of the extensions ("3-bar" menu button or Tools -> Add-ons -> Extensions) or if hardware acceleration or if userChrome.css/userContent.css is causing the problem.

• switch to the Default System theme: "3-bar" menu button or Tools -> Add-ons -> Themes
• do NOT click the "Refresh Firefox" button on the Troubleshoot Mode start window

• https://support.mozilla.org/en-US/kb/diagnose-firefox-issues-using-troubleshoot-mode
• https://support.mozilla.org/en-US/kb/troubleshoot-extensions-themes-to-fix-problems

Problem solved. Thanks everyone. The extension Dark Mode was the culprit causing the conflict. Is there another way to darken firefox? The bright white pages are hard on my eyes.

Mark it as resolved and have a good day.

Sounds that this extension uses a filter invert rule that affects images as well.