Steps to replicate? Can you provide proof of the issue? I just bought a few things on ebay this week and had no issue. see screenshot

The attached is an example of what happens. In goodwill I go to my list of favorites. I look at another item by using the left and right arrows and I go from favorites to an item and I "arrow" back and I now have the favorites showing as I want and the one I just looked at stays as a separate tab. Sometimes a third tab per example appears without me even doing a left or right arrow. This is an example and it also happens on eBay. It is not an eBay or goodwill problem. It is something in Firefox. I have version 105.0.1.

You should run that test with Firefox in Safe Mode. https://support.mozilla.org/en-US/kb/diagnose-firefox-issues-using-troubleshoot-mode#w_how-to-start-firefox-in-4troubleshoot-modesf5safe-modesf

I tried Safe and I still had tabs appear. However, much less. So I went ahead and did a reset. I think that has fixed the issue. I do thank you for your help!

Mark it as resolved and have a good day.