overlays.gentoo.org delivers insecure content (via HTTP) when you are accessing it by HTTPS: the header of the delivered web pages includes the image from http://overlays.gentoo.org/trac/gentoo-20060214/gentoo-overlays.png Reproduce: Use Firefox and go to https://overlays.gentoo.org/ with the warning for mixed content enabled. Or use openssl s_client or curl or whatever else to retrieve https://overlays.gentoo.org/ and grep for "http://". You can see that content is included via HTTP. *And* you can see many, many links which start with "http://overlays.gentoo.org/". While this is not an immediate problem, the links should really drop the protocol and domain parts so that users will stay on HTTPS once connected. Workaround: Use NoScript extension for Firefox and set it to always use HTTPS for overlays.gentoo.org. Or use a transparent proxy and filter the content.
jokey: your field.
the overlays.gentoo.org instance is unmaintained and I plan to replace it with redmine/chilli. Sorry but WONTFIX