It looks like Firefox is blocking files it believes are being used to track you. Unfortunately, it appears that Ebay also has core functionality components mixed into those files. Since Firefox is blocking those files from loading, Ebay will appear broken if your Enhanced Tracking Protection settings are too strict in Firefox.

To fix this, go to the Ebay website. You should see a little purple or blue shield icon on the left side of the Firefox address bar, next to the padlock icon. If you click it, press the little toggle switch to turn off Firefox's Enhanced Tracking Protection feature on Ebay. The website should reload automatically and it should be fixed.

See Enhanced Tracking Protection in Firefox for desktop for more information.

Hope this helps.

Hi Wesley.

Thank you for your help and the link you provided. I normally use Firefox in "never remember history" mode, and so far Ebay worked.

From your message i guess that Ebay has changed their way to display their website but they did not communicate to their sponsored affiliate Firefox in order for Firefox to adjust to them.

Because i see that Firefox in "never remember history" mode does not track (unlike Chome) user's activities, i prefer Firefox for my banking online and other sensitive data.

I guess that for the time being i will have to deal with my Ebay account on Chrome.

Thank you again for your help.

Regards.

You can possibly click the shield icon to disable Enhanced Tracking Protection for eBay websites of use a content blocking extension instead.