HTTPS Everywhere redirects http://trychooser.pub.build.mozilla.org/ to https://trychooser.pub.build.mozilla.org/, which fails with 403 Forbidden: "You don't have permission to access /error/noindex.html on this server."
(In reply to Jed Davis [:jld] from comment #0) > […] fails with 403 Forbidden: > "You don't have permission to access /error/noindex.html on this server." I should add: this occurs only if a TLS certificate error is bypassed: trychooser.pub.build.mozilla.org uses an invalid security certificate. The certificate is only valid for secure.pub.build.mozilla.org (Error code: ssl_error_bad_cert_domain)
This seems to have been fixed in HTTPS-Everywhere 3.5.3
Works for me. (If someone still wants to TLS-enable trychooser they can reopen, I assume.)