Last modified: 2014-02-12 23:52:43 UTC
Some change in common.css / other css broke this, was working fine till sometime back. Similar bug 34686 was fixed sometime back.
f0f2d138 introduced it. fixed in https://gerrit.wikimedia.org/r/5187 I've moved this to the firefox.css spreadsheet until I understand the problem it was trying to address better. I'm annoyed with myself for the vague commit message.