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I thought I'd provide an update on my attempts at having a custom error page returned at an OPAC. I started looking into hacking the error pages in Firefox itself (thanks, Kaleb!), but due to code-signing requirements, it seemed like a rabbit hole I'd want to avoid, at least for now (even though Easter is upon us :-). So I set up a Squid proxy server with the necessary network restrictions and a custom error page as previously reported, and I thought I nailed it until I found that this only works for HTTP requests. If it's HTTPS, the browser returns its own error. This behavior is apparently ubiquitous with all browsers according to what I found. Here's the most exhaustive posting I've found on the subject: https://squid-users.squid-cache.narkive.com/527KMD5K/squid-custom-error-page I don't suppose there's an extension that forces HTTP instead of HTTPS. So far I've found plenty that will rewrite a URL, but they only rewrite the address portion, and not the protocol. John Lolis Coordinator of Computer Systems 100 Martine Avenue White Plains, NY 10601 tel: 1.914.422.1497 fax: 1.914.422.1452 https://whiteplainslibrary.org/ *“I would rather have questions that can’t be answered than answers that can’t be questioned.”* — Richard Feynman <https://click.fourhourmail.com/5qure95xkf7hvvo93wh2/7qh7h8h05vr4zrtz/aHR0cHM6Ly9lbi53aWtpcGVkaWEub3JnL3dpa2kvUmljaGFyZF9GZXlubWFu>, theoretical physicist and recipient of the Nobel Prize in Physics in 1965