Firefox is preventing me from signing in to ebay.

What does that mean? Show us something so that we can better help you. Did you try with Firefox in Troubleshoot Mode? https://support.mozilla.org/en-US/kb/diagnose-firefox-issues-using-troubleshoot-mode#search

Did you clear your browser cache? https://support.mozilla.org/en-US/kb/clear-cookies-and-site-data-firefox

Windows home or pro? What security software besides MS Defender are you running?

It works for me. see screenshot

Thanks for your reply. I am not tech savvy whatsoever. I switched to Chrome and had no problem. Browser cache is set to clear when Firefox is closed. I have Windows home. If the ebay problem continues, I will send the question again.

Alrighty then... mark it as resolved get it off our plate and we'll leave the light on for ya.