I'm not sure if this is because I'm visiting from a page with an https URL or if it's something caused by the https-everywhere extension I recently installed.

I am using Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:27.0) Gecko/20100101 Firefox/27.0.

I understand that SE is still working on support for HTTPS and that the support is so far incomplete. This is a bug report, not a request for help.

ADDED 2014-02-24: The URL of the broken image is, as predicted below by user 127.0.9.6, is http://stack-exchange-dynamic-ads.herokuapp.com/bounty.png

• It's not a bug, it's a feature! :-P – Asaf Karagila Feb 25 '14 at 7:57

Sorry about this. By design, browsers will not send the referer when coming from an HTTPS site to a non-HTTPS site, which breaks the ad.

To counteract this, I've added a route where you can specify the site manually. This should work for all users: