How do I remove an exception I added to a website that came up as having "an insecure connection?"

I tried to connect to a trusted website I use regularly, but I kept getting the pop-up saying that website had an insecure connection. Normally, I just disconnect and reconnect my wifi and then I can get back on the site. It seems like it's just a fluke in the site's security setup or something because like I said, this is a website I use every single day. Anyway, this time I got frustrated with it since the disconnecting/reconnecting wifi thing wasn't working, so I clicked "add exception." Now when I type in the website address "https://aax-us-pdx.amazon-adsystem.com/" this shows up in the search bar instead and no website loads at all. I can't figure out how to remove this "add exception" part from this website. I'd rather have an "insecure connection" pop-up than just this blank page with a weird web address. Does anyone know how to remove the exception or where to view a list of websites I've added these exceptions to once you've already set it that way?